Q: What permissions do I need to enable when creating the ClientID to use OAuth for the mail accounts in versaSRS?
A: You will need to ensure the below permissions are configured:
To enable the final permission shown on the list you can find it by following the below picture reference.
Please visit the following links for further information on authenticating an EWS application using OAuth and registering an application with the Microsoft identity platform.
If you wish to further restrict the OAuth permissions to only access particular mailboxes please refer to this link.