diff --git a/pkg/services/authn/authnimpl/sync/org_sync_test.go b/pkg/services/authn/authnimpl/sync/org_sync_test.go
index b2083f3a3e4..93d46e8f823 100644
--- a/pkg/services/authn/authnimpl/sync/org_sync_test.go
+++ b/pkg/services/authn/authnimpl/sync/org_sync_test.go
@@ -84,9 +84,8 @@ func TestOrgSync_SyncOrgRolesHook(t *testing.T) {
 					ClientParams: authn.ClientParams{
 						SyncOrgRoles: true,
 						LookUpParams: login.UserLookupParams{
-							UserID: nil,
-							Email:  ptrString("test"),
-							Login:  nil,
+							Email: ptrString("test"),
+							Login: nil,
 						},
 					},
 				},
@@ -102,9 +101,8 @@ func TestOrgSync_SyncOrgRolesHook(t *testing.T) {
 				ClientParams: authn.ClientParams{
 					SyncOrgRoles: true,
 					LookUpParams: login.UserLookupParams{
-						UserID: nil,
-						Email:  ptrString("test"),
-						Login:  nil,
+						Email: ptrString("test"),
+						Login: nil,
 					},
 				},
 			},
diff --git a/pkg/services/authn/authnimpl/sync/user_sync.go b/pkg/services/authn/authnimpl/sync/user_sync.go
index 23d0d6f9042..2f56cac8884 100644
--- a/pkg/services/authn/authnimpl/sync/user_sync.go
+++ b/pkg/services/authn/authnimpl/sync/user_sync.go
@@ -368,14 +368,6 @@ func (s *UserSync) lookupByOneOf(ctx context.Context, params login.UserLookupPar
 	var usr *user.User
 	var err error
 
-	// If not found, try to find the user by id
-	if params.UserID != nil && *params.UserID != 0 {
-		usr, err = s.userService.GetByID(ctx, &user.GetUserByIDQuery{ID: *params.UserID})
-		if err != nil && !errors.Is(err, user.ErrUserNotFound) {
-			return nil, err
-		}
-	}
-
 	// If not found, try to find the user by email address
 	if usr == nil && params.Email != nil && *params.Email != "" {
 		usr, err = s.userService.GetByEmail(ctx, &user.GetUserByEmailQuery{Email: *params.Email})
diff --git a/pkg/services/authn/authnimpl/sync/user_sync_test.go b/pkg/services/authn/authnimpl/sync/user_sync_test.go
index 9449547d75a..01c0866a205 100644
--- a/pkg/services/authn/authnimpl/sync/user_sync_test.go
+++ b/pkg/services/authn/authnimpl/sync/user_sync_test.go
@@ -25,10 +25,6 @@ func ptrBool(b bool) *bool {
 	return &b
 }
 
-func ptrInt64(i int64) *int64 {
-	return &i
-}
-
 func TestUserSync_SyncUserHook(t *testing.T) {
 	userProtection := &authinfoimpl.OSSUserProtectionImpl{}
 
@@ -120,9 +116,8 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 					Email: "test",
 					ClientParams: authn.ClientParams{
 						LookUpParams: login.UserLookupParams{
-							UserID: nil,
-							Email:  ptrString("test"),
-							Login:  nil,
+							Email: ptrString("test"),
+							Login: nil,
 						},
 					},
 				},
@@ -135,9 +130,8 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 				Email: "test",
 				ClientParams: authn.ClientParams{
 					LookUpParams: login.UserLookupParams{
-						UserID: nil,
-						Email:  ptrString("test"),
-						Login:  nil,
+						Email: ptrString("test"),
+						Login: nil,
 					},
 				},
 			},
@@ -159,9 +153,8 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 					ClientParams: authn.ClientParams{
 						SyncUser: true,
 						LookUpParams: login.UserLookupParams{
-							UserID: nil,
-							Email:  ptrString("test"),
-							Login:  nil,
+							Email: ptrString("test"),
+							Login: nil,
 						},
 					},
 				},
@@ -176,9 +169,8 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 				ClientParams: authn.ClientParams{
 					SyncUser: true,
 					LookUpParams: login.UserLookupParams{
-						UserID: nil,
-						Email:  ptrString("test"),
-						Login:  nil,
+						Email: ptrString("test"),
+						Login: nil,
 					},
 				},
 			},
@@ -200,9 +192,8 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 					ClientParams: authn.ClientParams{
 						SyncUser: true,
 						LookUpParams: login.UserLookupParams{
-							UserID: nil,
-							Email:  nil,
-							Login:  ptrString("test"),
+							Email: nil,
+							Login: ptrString("test"),
 						},
 					},
 				},
@@ -216,52 +207,10 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 				IsGrafanaAdmin: ptrBool(false),
 				ClientParams: authn.ClientParams{
 					LookUpParams: login.UserLookupParams{
-						UserID: nil,
-						Email:  nil,
-						Login:  ptrString("test"),
-					},
-					SyncUser: true,
-				},
-			},
-		},
-		{
-			name: "sync - user found in DB - by ID",
-			fields: fields{
-				userService:     userService,
-				authInfoService: authFakeNil,
-				quotaService:    &quotatest.FakeQuotaService{},
-			},
-			args: args{
-				ctx: context.Background(),
-				id: &authn.Identity{
-					ID:    "",
-					Login: "test",
-					Name:  "test",
-					Email: "test",
-					ClientParams: authn.ClientParams{
-						SyncUser: true,
-						LookUpParams: login.UserLookupParams{
-							UserID: ptrInt64(1),
-							Email:  nil,
-							Login:  nil,
-						},
+						Email: nil,
+						Login: ptrString("test"),
 					},
-				},
-			},
-			wantErr: false,
-			wantID: &authn.Identity{
-				ID:             "user:1",
-				Login:          "test",
-				Name:           "test",
-				Email:          "test",
-				IsGrafanaAdmin: ptrBool(false),
-				ClientParams: authn.ClientParams{
 					SyncUser: true,
-					LookUpParams: login.UserLookupParams{
-						UserID: ptrInt64(1),
-						Email:  nil,
-						Login:  nil,
-					},
 				},
 			},
 		},
@@ -284,9 +233,8 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 					ClientParams: authn.ClientParams{
 						SyncUser: true,
 						LookUpParams: login.UserLookupParams{
-							UserID: nil,
-							Email:  nil,
-							Login:  nil,
+							Email: nil,
+							Login: nil,
 						},
 					},
 				},
@@ -303,9 +251,8 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 				ClientParams: authn.ClientParams{
 					SyncUser: true,
 					LookUpParams: login.UserLookupParams{
-						UserID: nil,
-						Email:  nil,
-						Login:  nil,
+						Email: nil,
+						Login: nil,
 					},
 				},
 			},
@@ -329,9 +276,8 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 					ClientParams: authn.ClientParams{
 						SyncUser: true,
 						LookUpParams: login.UserLookupParams{
-							UserID: nil,
-							Email:  nil,
-							Login:  nil,
+							Email: nil,
+							Login: nil,
 						},
 					},
 				},
@@ -360,9 +306,8 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 						AllowSignUp: true,
 						EnableUser:  true,
 						LookUpParams: login.UserLookupParams{
-							UserID: nil,
-							Email:  ptrString("test_create"),
-							Login:  nil,
+							Email: ptrString("test_create"),
+							Login: nil,
 						},
 					},
 				},
@@ -381,9 +326,8 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 					AllowSignUp: true,
 					EnableUser:  true,
 					LookUpParams: login.UserLookupParams{
-						UserID: nil,
-						Email:  ptrString("test_create"),
-						Login:  nil,
+						Email: ptrString("test_create"),
+						Login: nil,
 					},
 				},
 			},
@@ -408,9 +352,8 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 						SyncUser:   true,
 						EnableUser: true,
 						LookUpParams: login.UserLookupParams{
-							UserID: ptrInt64(3),
-							Email:  nil,
-							Login:  nil,
+							Email: nil,
+							Login: ptrString("test"),
 						},
 					},
 				},
@@ -427,9 +370,8 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 					SyncUser:   true,
 					EnableUser: true,
 					LookUpParams: login.UserLookupParams{
-						UserID: ptrInt64(3),
-						Email:  nil,
-						Login:  nil,
+						Email: nil,
+						Login: ptrString("test"),
 					},
 				},
 			},
@@ -455,9 +397,8 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 						SyncUser:   true,
 						EnableUser: true,
 						LookUpParams: login.UserLookupParams{
-							UserID: ptrInt64(3),
-							Email:  nil,
-							Login:  nil,
+							Email: nil,
+							Login: ptrString("test"),
 						},
 					},
 				},
@@ -475,9 +416,8 @@ func TestUserSync_SyncUserHook(t *testing.T) {
 					SyncUser:   true,
 					EnableUser: true,
 					LookUpParams: login.UserLookupParams{
-						UserID: ptrInt64(3),
-						Email:  nil,
-						Login:  nil,
+						Email: nil,
+						Login: ptrString("test"),
 					},
 				},
 			},
diff --git a/pkg/services/authn/clients/ext_jwt_test.go b/pkg/services/authn/clients/ext_jwt_test.go
index 7ef5ecc7716..fe8c1135897 100644
--- a/pkg/services/authn/clients/ext_jwt_test.go
+++ b/pkg/services/authn/clients/ext_jwt_test.go
@@ -21,7 +21,6 @@ import (
 	"github.com/grafana/grafana/pkg/models/roletype"
 	"github.com/grafana/grafana/pkg/models/usertoken"
 	"github.com/grafana/grafana/pkg/services/authn"
-	"github.com/grafana/grafana/pkg/services/login"
 	"github.com/grafana/grafana/pkg/services/signingkeys"
 	"github.com/grafana/grafana/pkg/services/signingkeys/signingkeystest"
 	"github.com/grafana/grafana/pkg/services/user"
@@ -176,8 +175,7 @@ func TestExtendedJWT_Authenticate(t *testing.T) {
 				ClientParams: authn.ClientParams{SyncUser: false,
 					AllowSignUp: false, EnableUser: false, FetchSyncedUser: false,
 					SyncTeams: false, SyncOrgRoles: false, CacheAuthProxyKey: "",
-					LookUpParams: login.UserLookupParams{UserID: (*int64)(nil),
-						Email: (*string)(nil), Login: (*string)(nil)}, SyncPermissions: true,
+					SyncPermissions:        true,
 					FetchPermissionsParams: authn.FetchPermissionsParams{ActionsLookup: []string(nil), Roles: []string{"fixed:folders:reader"}}},
 				Permissions: map[int64]map[string][]string(nil), IDToken: ""},
 			wantErr: nil,
@@ -208,7 +206,6 @@ func TestExtendedJWT_Authenticate(t *testing.T) {
 				ClientParams: authn.ClientParams{SyncUser: false, AllowSignUp: false,
 					EnableUser: false, FetchSyncedUser: true, SyncTeams: false,
 					SyncOrgRoles: false, CacheAuthProxyKey: "",
-					LookUpParams:    login.UserLookupParams{UserID: (*int64)(nil), Email: (*string)(nil), Login: (*string)(nil)},
 					SyncPermissions: true,
 					FetchPermissionsParams: authn.FetchPermissionsParams{ActionsLookup: []string{"dashboards:create",
 						"folders:read", "datasources:explore", "datasources.insights:read"},
diff --git a/pkg/services/authn/clients/grafana_test.go b/pkg/services/authn/clients/grafana_test.go
index f77d233744f..b2cb45154ec 100644
--- a/pkg/services/authn/clients/grafana_test.go
+++ b/pkg/services/authn/clients/grafana_test.go
@@ -116,7 +116,6 @@ func TestGrafana_AuthenticateProxy(t *testing.T) {
 
 				assert.EqualValues(t, tt.expectedIdentity.ClientParams.LookUpParams.Email, identity.ClientParams.LookUpParams.Email)
 				assert.EqualValues(t, tt.expectedIdentity.ClientParams.LookUpParams.Login, identity.ClientParams.LookUpParams.Login)
-				assert.EqualValues(t, tt.expectedIdentity.ClientParams.LookUpParams.UserID, identity.ClientParams.LookUpParams.UserID)
 			} else {
 				assert.Nil(t, tt.expectedIdentity)
 			}
diff --git a/pkg/services/authn/clients/jwt_test.go b/pkg/services/authn/clients/jwt_test.go
index d9476f37320..f5d0dbd09ad 100644
--- a/pkg/services/authn/clients/jwt_test.go
+++ b/pkg/services/authn/clients/jwt_test.go
@@ -57,9 +57,8 @@ func TestAuthenticateJWT(t *testing.T) {
 					SyncPermissions: true,
 					SyncTeams:       true,
 					LookUpParams: login.UserLookupParams{
-						UserID: nil,
-						Email:  stringPtr("eai.doe@cor.po"),
-						Login:  stringPtr("eai-doe"),
+						Email: stringPtr("eai.doe@cor.po"),
+						Login: stringPtr("eai-doe"),
 					},
 				},
 			},
@@ -111,9 +110,8 @@ func TestAuthenticateJWT(t *testing.T) {
 					SyncPermissions: true,
 					SyncTeams:       false,
 					LookUpParams: login.UserLookupParams{
-						UserID: nil,
-						Email:  stringPtr("eai.doe@cor.po"),
-						Login:  stringPtr("eai-doe"),
+						Email: stringPtr("eai.doe@cor.po"),
+						Login: stringPtr("eai-doe"),
 					},
 				},
 			},
diff --git a/pkg/services/authn/clients/oauth_test.go b/pkg/services/authn/clients/oauth_test.go
index 65916f3b435..95838da0159 100644
--- a/pkg/services/authn/clients/oauth_test.go
+++ b/pkg/services/authn/clients/oauth_test.go
@@ -308,7 +308,6 @@ func TestOAuth_Authenticate(t *testing.T) {
 
 				assert.EqualValues(t, tt.expectedIdentity.ClientParams.LookUpParams.Email, identity.ClientParams.LookUpParams.Email)
 				assert.EqualValues(t, tt.expectedIdentity.ClientParams.LookUpParams.Login, identity.ClientParams.LookUpParams.Login)
-				assert.EqualValues(t, tt.expectedIdentity.ClientParams.LookUpParams.UserID, identity.ClientParams.LookUpParams.UserID)
 			} else {
 				assert.Nil(t, tt.expectedIdentity)
 			}
diff --git a/pkg/services/ldap/api/service.go b/pkg/services/ldap/api/service.go
index 2d5de2a1da2..71c85c4fafe 100644
--- a/pkg/services/ldap/api/service.go
+++ b/pkg/services/ldap/api/service.go
@@ -331,9 +331,6 @@ func (s *Service) identityFromLDAPUser(user *login.ExternalUserInfo) *authn.Iden
 			EnableUser:   true,
 			SyncOrgRoles: !s.cfg.LDAPSkipOrgRoleSync,
 			AllowSignUp:  s.cfg.LDAPAllowSignup,
-			LookUpParams: login.UserLookupParams{
-				UserID: &user.UserId,
-			},
 		},
 	}
 }
diff --git a/pkg/services/login/model.go b/pkg/services/login/model.go
index 3ec4b55d99e..b11ec2161f3 100644
--- a/pkg/services/login/model.go
+++ b/pkg/services/login/model.go
@@ -104,9 +104,8 @@ type GetUserByAuthInfoQuery struct {
 
 type UserLookupParams struct {
 	// Describes lookup order as well
-	UserID *int64  // if set, will try to find the user by id
-	Email  *string // if set, will try to find the user by email
-	Login  *string // if set, will try to find the user by login
+	Email *string // if set, will try to find the user by email
+	Login *string // if set, will try to find the user by login
 }
 
 type GetAuthInfoQuery struct {
diff --git a/pkg/services/user/userimpl/user.go b/pkg/services/user/userimpl/user.go
index 4dbe3e4114d..14c3be1ce7a 100644
--- a/pkg/services/user/userimpl/user.go
+++ b/pkg/services/user/userimpl/user.go
@@ -209,14 +209,7 @@ func (s *Service) Delete(ctx context.Context, cmd *user.DeleteUserCommand) error
 }
 
 func (s *Service) GetByID(ctx context.Context, query *user.GetUserByIDQuery) (*user.User, error) {
-	user, err := s.store.GetByID(ctx, query.ID)
-	if err != nil {
-		return nil, err
-	}
-	if err := s.store.CaseInsensitiveLoginConflict(ctx, user.Login, user.Email); err != nil {
-		return nil, err
-	}
-	return user, nil
+	return s.store.GetByID(ctx, query.ID)
 }
 
 func (s *Service) GetByLogin(ctx context.Context, query *user.GetUserByLoginQuery) (*user.User, error) {