Exchange 2019 auth login 535 5.7.3 Authentication unsuccessful

Damir Gimazetdinov 20 Reputation points

Hello everyone I have a problem with enabling oauth login. I successfully login via telnet with enterprise admin right but simple user get error "535 5.7.3 Authentication unsuccessful" on this reason could some body help me?

when I log in with admin rightUser's image

when login with domain user right

User's image

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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Microsoft Exchange
Microsoft Exchange
Microsoft messaging and collaboration software.
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Accepted answer
  1. Kael Yao-MSFT 37,586 Reputation points Microsoft Vendor

    Hi @Damir Gimazetdinov

    Have you created an additional receive connector for the telnet client ( in this case) or are you using the default ones?

    Please enable protocol log on the receive connector if you haven't yet.

    In the protocol log you would be able to see the detailed reason why the authentication failed.



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