Email Connector Error - 535 5.7.3 Authentication unsuccessful

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Hi all,   I can log in to my account successfully with my Basic Credentials on Email Connector module.   Though, the case we use the same account on our Company's Microsoft Entra connection we got "535 5.7.3 Authentication unsuccessful" error.   We have checked the permissions but we could not solve the problem.   Can you help us with this situation?
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