MicrosoftMicrosoftGet-AuthenticationPolicy returns nothing within EXO tenant so not used at the moment.
Basic auth is now disabled in all EXO tenants by MS but is it a best practice to create an auth policy that blocks Basic authentication?
MicrosoftSMTP still allows basic authentication. You can block SMTP / create the policy that applies to mailboxes that still use them as per Enable or disable SMTP AUTH in Exchange Online | Microsoft Learn. Other than that, you do not need to set auth policies for other mailbox protocols.
