Server denied POP3 access received when trying to add another account to Check mail from other accounts setting
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Problem
You are unable to add another Google Workspace account to the setting Check mail from other accounts when using an account without 2SV due to the error: Server denied POP3 access to given username and password.
Environment
Gmail web interface
Solution
Open a new incognito window and go to Google Mail.
Sign in to the account you are trying to add in Check mail from other accounts.