What exactly is missing for broad acceptance ?
https://openid.net/specs/openid-connect-discovery-1_0.html defines some pretty clear ways to autodiscover the endpoints. MS & Google and Keycloak both offer this URL: https://login.microsoftonline.com/domain.com/.well-known/openid-configuration https://accounts.google.com/.well-known/openid-configuration I believe the latest Yahoo mobile app won't even connect to imap/smtp servers that don't have oauth2 support. It seems as if the big guys are closing down the eco-system...
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