Email – Authentication issues
On February 1, 2021, Microsoft replaces the basic authentication system with a more secure model: OAuth2.0. This change affects email services such as: Gmail, Thunderbird, Mail Mac, Outlook, among others.
E-mail accounts with settings made for IMAP/POP, through the old template, will no longer communicate making it necessary to reconfigure them to Exchange.
Here's how to set up your email account.