OpenID Connect Invalid Client or credentials

Hello everyone,

I am trying to authenticate on GitLab via OpenId Connect service. I followed this documentation https://docs.gitlab.com/ce/administration/auth/oidc.html. However I still encounter some issue.

I am correctly redirected to my openID provider and able to login. If I enter a wrong password the provider is telling me that it does not know me which is fine. But as soon as I put correct credentials gitlab throw me this error with no more informations on what is going on.

Could not authenticate you from OpenIDConnect because "Invalid client :: invalid client or client credentials.".

It seems that gitlab does not know where to find my user or what permission it has to give.
Since it’s an already existing account I already try to link my account while Iam logged in via
Setting/account/OpenIDproviderXXX

I am running short on option is there anyway to have a more explicit traceback ?

Thanks