While trying to add a Googe GSuite email account in Microsoft Outlook, you may find it impossible to authenticate – Outlook will keep displaying the username/password dialogue during the account setup.
This is likely because by default Outlook is considered a “less secure” app by Google and won’t allow the connection.
Check out the “Let less secure apps use your account” page at https://support.google.com/accounts/answer/6010255?hl=en&authuser=1 for instruction on how to let a GSuite user allow Outlook to access their account.
Note: The GSuite domain owner will need to first update a setting in the domain administration to allow users to access the page that has the switch for their account.
I can’t remember the exact location of the domain admin setting, but log into your GSuite domain account and do a search for “less secure app account access” – you should easily find it then.