User_saml does not seem to handle RelayState=https://cloud.example.nl:8006/ URL correctly? "User is already logged-in"

Hello everybody,

My SAML portal creates URLs after being logged in, and they work fine for Rocket.Chat and mom_mellon apps but Nextcloud user_saml returns an “User is already logged-in”

https://ipsilon03.example.nl/idp/saml2/SSO/Redirect?SPIdentifier=https://cloud.example.nl:8006/nextcloud/index.php/apps/user_saml/saml/metadata&RelayState=https://cloud.example.nl:8006/