Return
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Title
AADSTS90019: No tenant-identifying information found in either the request or implied by any provided credentials -
Description
When trying to connect to Office 365 tenant Essentials for Office 365 throws an error: Authentication Failure AADSTS90019
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Cause
Use of Down-Level Logon Name (domain\username) instead of UPN format such as UserName@Example.Microsoft.com when authenticating to Office 365
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Resolution
Use UPN format, such as UserName@Example.Microsoft.com to authenticate to Office 365.