Why do I get an IMAP error

[syoterun]

I get an error when trying to read an email via IMAP.

 

[nicanil]

Did you turn on IMAP and Less secure apps for this account?

 

[syoterun]

The setting has already been completed.

 

[nicanil]

Just checked with enabled "Settings auto-detect" and everything was fine.
Make sure both IMAP and Less secure apps enabled.
Recheck password and login.