ResolutionĬhange the primary SMTP address of the Microsoft 365 group. The primary SMTP address of the group should use the following the primary SMTP address of the group is the Autodiscover request fails because no object exists in the on-premises environment that represents the group. For example: groups use an Autodiscover XML file that's located in the %LocalAppData%\Microsoft\Outlook\16 folder. This issue occurs if the primary SMTP address of the Microsoft 365 group uses an incorrect format.
However, users can access the group through Outlook on the web. When you create a Microsoft 365 group in this scenario, users can't access the group through Microsoft Outlook 2016, Outlook 2019, or Outlook for Microsoft 365. In this situation, your Autodiscover record resolves to an on-premises Exchange server, and users' mailboxes are in Exchange Online. You have a hybrid deployment of Exchange Online in Microsoft 365 and on-premises Exchange Server.
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