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I want to identify if a user's email address is associated with an office 365 subscription. I know that in one case I can query dns dig example.com mx and look for .mail.protection.outlook.com. in the output. But that doesn't catch everyone.

Is there anything else I can do to identify which of my users should be able to log in with oauth2?

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If you take the domain of the email address you want to query and do a Get against

https://login.microsoftonline.com/{domain}/v2.0/.well-known/openid-configuration

That will return the OpenID Connect metadata document which should have all the information you need to determine that https://learn.microsoft.com/en-us/azure/active-directory/develop/v2-protocols-oidc

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