I’ve setup my gmail account using oauth2 for quite some time, no problems whatsoever.
Yesterday (18th of May), while K-9 was synchronizing - as it regularly does - I got this notice:
authentication failed [account name] Check your server settings.
On Thunderbird I can still log in to my gmail account, same settings.
I was a bit behind in version, cannot recall which exactly. I updated to 6.602, the one proposed on F-Droid, although I see that there is 6.702 also.
Any ideas why this happened? Anybody else having connection issues with their gmail account using oauth2? I suppose I can try to make a new connection using oath2, but trying to fix it before going there.