openid / roundcube example

Does anyone have a current config example using openid and with roundcube. I like to add this next to 'regular' logins'. I was able to login once but know I am getting these in the logs

" No requests to service for this peer (1 connections exist, 0 pending)"

I have added the 2 passdb with links to dovecot-oauth2.token.conf.ext from this manual[1], but it is not really clear if I need these and can just add a config file with openid_configuration_url

[1] https://doc.dovecot.org/2.3/configuration_manual/authentication/oauth2/