Good morning, the only user who is using the two-factor verification is unable to send emails from his mobile, he have set it up with my assistance by adding the verification code onto his iPhone and he is successfully receiving all emails, but he can not send them from the device - it says, wrong user nam or password, this issue started about 1 week ago, before that all emails were sent successfully.
None of this behaviour is repeating on his desktop computer, where he is using Outlook.