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> On 04/10/2022 19:07 EEST Simon <sp12 at 31337.it> wrote: > > > I would like to authenticate users that use the PLAIN mechanism against an oauth2 idp (in this case it's an Azure AD B2C). > I configured dovecot.conf with ><snip/>> > > So, why does dovecot say "No username returned"? The username is there! Do I have to configure something else?Hi! Does it work if you set introspection_mode=local? Aki