[Bug] MSAL OAuth2 + EWS not working

Which Version of MSAL are you using ? 4.1.0

Platform Net 4.7

What authentication flow has the issue?

• Desktop / Mobile
  • [ x ] Interactive

Other? - please describe;

Is this a new or existing app? New App

Repro Follow: https://docs.microsoft.com/en-us/exchange/client-developer/exchange-web-services/how-to-authenticate-an-ews-application-by-using-oauth

Use an outlook.com account to login after setting the audience in above tutorial to support personal and work accounts.

Code sample is included in above tutorial

Expected behavior You see the folders in your mailbox

Actual behavior

Error: System.ArgumentException: The given token is invalid.
   at Microsoft.Exchange.WebServices.Data.OAuthCredentials..ctor(String token, Boolean verbatim)
   at Microsoft.Exchange.WebServices.Data.OAuthCredentials..ctor(String token)
   at EwsOAuth.Program.<MainAsync>d__1.MoveNext() in C:\Users\dev\source\repos\EWS\EWS\Program.cs:line 43

Possible Solution

Additional context/ Logs / Screenshots It’s really easy to reproduce.

Try logging-in using an outlook.com account.

[dsanghan]

To be clear, the token works if I sign in with an Office365 account, but does not work if I sign in with an Outlook account.

[jmprieur]

@guidedways : I’ve contacted people on the Office side. again this is not MSAL, but how the token is being used by ews-managed-api.