How to use a Gmail/Google Workspace account with K-9 Mail?

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How do I update an existing Gmail account to use OAuth 2.0?

If you used your Google password when adding a Gmail account to K-9 Mail, you need to use the new mechanism to be able to still access your messages. For this to work, make sure you’re using K-9 Mail 6.200 or newer. We tried to make the transition as easy as possible without forcing users that use app-specific passwords to switch to OAuth 2.0. The somewhat automatic way Inside K-9 Mail, manually check your Gmail account for new messages. You should see an “Authentication failed” notification…