diff --git a/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Api/Providers/OidcRp.pm b/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Api/Providers/OidcRp.pm
index 1058b8237..abfb2db9d 100644
--- a/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Api/Providers/OidcRp.pm
+++ b/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Api/Providers/OidcRp.pm
@@ -123,13 +123,13 @@ sub addOidcRp {
     return $self->sendError(
         $req,
         "Invalid input: An OIDC RP with confKey $add->{confKey} already exists",
-        400
+        409
     ) if ( defined $self->_getOidcRpByConfKey( $conf, $add->{confKey} ) );
 
     return $self->sendError(
         $req,
 "Invalid input: An OIDC RP with clientId $add->{clientId} already exists",
-        400
+        409
     ) if ( defined $self->_getOidcRpByClientId( $conf, $add->{clientId} ) );
 
     $add->{options} = {} unless ( defined $add->{options} );
@@ -172,7 +172,7 @@ sub updateOidcRp {
     # check if new clientID exists already
     my $res = $self->_isNewOidcRpClientIdUnique( $conf, $confKey, $update );
 
-    return $self->sendError( $req, $res->{msg}, 400 )
+    return $self->sendError( $req, $res->{msg}, 409 )
       unless ( $res->{res} eq 'ok' );
 
     $res = $self->_pushOidcRp( $conf, $confKey, $update, 0 );
@@ -230,7 +230,7 @@ sub replaceOidcRp {
 
     # check if new clientID exists already
     my $res = $self->_isNewOidcRpClientIdUnique( $conf, $confKey, $replace );
-    return $self->sendError( $req, $res->{msg}, 400 )
+    return $self->sendError( $req, $res->{msg}, 409 )
       unless ( $res->{res} eq 'ok' );
 
     $replace->{options} = {} unless ( defined $replace->{options} );
diff --git a/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Api/Providers/SamlSp.pm b/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Api/Providers/SamlSp.pm
index b9b5f9147..c679469a4 100644
--- a/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Api/Providers/SamlSp.pm
+++ b/lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Api/Providers/SamlSp.pm
@@ -107,11 +107,11 @@ sub addSamlSp {
     return $self->sendError(
         $req,
         "Invalid input: A SAML SP with confKey $add->{confKey} already exists",
-        400
+        409
     ) if ( defined $self->_getSamlSpByConfKey( $conf, $add->{confKey} ) );
 
     return $self->sendError( $req,
-        "Invalid input: A SAML SP with entityID $entityId already exists", 400 )
+        "Invalid input: A SAML SP with entityID $entityId already exists", 409 )
       if ( defined $self->_getSamlSpByEntityId( $conf, $entityId ) );
 
     my $res = $self->_pushSamlSp( $conf, $add->{confKey}, $add, 1 );
@@ -152,7 +152,7 @@ sub replaceSamlSp {
     # check if new entityId exists already
     my $res = $self->_isNewSamlSpEntityIdUnique( $conf, $confKey, $replace );
 
-    return $self->sendError( $req, $res->{msg}, 400 )
+    return $self->sendError( $req, $res->{msg}, 409 )
       unless ( $res->{res} eq 'ok' );
 
     $res = $self->_pushSamlSp( $conf, $confKey, $replace, 1 );
@@ -192,7 +192,7 @@ sub updateSamlSp {
         # check if new entityId exists already
         $res = $self->_isNewSamlSpEntityIdUnique( $conf, $confKey, $update );
 
-        return $self->sendError( $req, $res->{msg}, 400 )
+        return $self->sendError( $req, $res->{msg}, 409 )
           unless ( $res->{res} eq 'ok' );
 
     }
diff --git a/lemonldap-ng-manager/t/04-providers-api.t b/lemonldap-ng-manager/t/04-providers-api.t
index cb59b22fe..a451367b9 100644
--- a/lemonldap-ng-manager/t/04-providers-api.t
+++ b/lemonldap-ng-manager/t/04-providers-api.t
@@ -19,6 +19,16 @@ sub check200 {
 
 }
 
+sub check409 {
+    my ( $test, $res ) = splice @_;
+
+    #diag Dumper($res);
+    is( $res->[0], "409", "$test: Result code is 409" )
+      or diag explain $res->[2];
+    count(1);
+    checkJson( $test, $res );
+}
+
 sub check404 {
     my ( $test, $res ) = splice @_;
 
@@ -72,7 +82,7 @@ sub checkAdd {
 
 sub checkAddFailsIfExists {
     my ( $test, $type, $add ) = splice @_;
-    check400( $test, add( $test, $type, $add ) );
+    check409( $test, add( $test, $type, $add ) );
 }
 
 sub checkAddWithUnknownAttributes {
@@ -145,7 +155,7 @@ sub checkUpdateNotFound {
 
 sub checkUpdateFailsIfExists {
     my ( $test, $type, $confKey, $update ) = splice @_;
-    check400( $test, update( $test, $type, $confKey, $update ) );
+    check409( $test, update( $test, $type, $confKey, $update ) );
 }
 
 sub checkUpdateWithUnknownAttributes {
@@ -323,7 +333,7 @@ checkGet( $test, 'oidc/rp', 'myOidcRp1', 'options/clientSecret', 'secret' );
 $test = "OidcRp - Check attribute default value was set after add";
 checkGet( $test, 'oidc/rp', 'myOidcRp1', 'options/IDTokenSignAlg', 'HS512' );
 
-$test = "OidcRp - Add Should fail on duplicate confKey";
+$test = "OidcRp - Add should fail on duplicate confKey";
 checkAddFailsIfExists( $test, 'oidc/rp', $oidcRp );
 
 $test = "OidcRp - Update should succeed and keep existing values";
@@ -354,12 +364,12 @@ $oidcRp->{options}->{playingPossum} = 'elephant';
 checkUpdateWithUnknownAttributes( $test, 'oidc/rp', 'myOidcRp1', $oidcRp );
 delete $oidcRp->{options}->{playingPossum};
 
-$test = "OidcRp - Add Should fail on duplicate clientId";
+$test               = "OidcRp - Add should fail on duplicate clientId";
 $oidcRp->{clientId} = "myOidcClient1";
-$oidcRp->{confKey} = 'myOidcRp2';
+$oidcRp->{confKey}  = 'myOidcRp2';
 checkAddFailsIfExists( $test, 'oidc/rp', $oidcRp );
 
-$test               = "OidcRp - Add Should fail on non existing options";
+$test               = "OidcRp - Add should fail on non existing options";
 $oidcRp->{confKey}  = 'myOidcRp2';
 $oidcRp->{clientId} = 'myOidcClient2';
 $oidcRp->{options}->{playingPossum} = 'ElephantInTheRoom';
@@ -482,7 +492,7 @@ checkGet( $test, 'saml/sp', 'mySamlSp1',
 $test = "SamlSp -  Check attribute default value was set after add";
 checkGet( $test, 'saml/sp', 'mySamlSp1', 'options/notOnOrAfterTimeout', 72000 );
 
-$test = "SamlSp -  Add Should fail on duplicate confKey";
+$test = "SamlSp -  Add should fail on duplicate confKey";
 checkAddFailsIfExists( $test, 'saml/sp', $samlSp );
 
 $test = "SamlSp -  Update should succeed and keep existing values";
@@ -516,11 +526,11 @@ $samlSp->{options}->{playingPossum} = 'elephant';
 checkUpdateWithUnknownAttributes( $test, 'saml/sp', 'mySamlSp1', $samlSp );
 delete $samlSp->{options}->{playingPossum};
 
-$test = "SamlSp -  Add Should fail on duplicate entityId";
+$test = "SamlSp -  Add should fail on duplicate entityId";
 $samlSp->{confKey} = 'mySamlSp2';
 checkAddFailsIfExists( $test, 'saml/sp', $samlSp );
 
-$test               = "SamlSp -  Add Should fail on non existing options";
+$test               = "SamlSp -  Add should fail on non existing options";
 $samlSp->{confKey}  = 'mySamlSp2';
 $samlSp->{metadata} = $metadata2;
 $samlSp->{options}->{playingPossum} = 'ElephantInTheRoom';