[MM3-users] nextcloud as auth provider for postorius

Hello,

have anybody successful setup nextcloud auth provider for postorius? I have done configured the OAuth 2.0-Client in nextcloud/index.php/settings/admin/security. I have add the nexcloud as social application in mailman3/admin/socialaccount/socialapp/. If i try to login via nexcloud, postorius redirect me to the nextcloud, where i successful login, and redirected to postorius But i'm not logged in postorius.

what I'm missing? Have anybody a howto?

Thanks Falk