Is the user internal to your organization, i.e. does he have a mailbox within the same tenant? It looks like OWA is detecting it as mail user instead, so check on its status.
Outlook Calendar - Sharing and Permissions "Can edit" missing
For one specific user, the ability to be granted "Can edit" access to a shared calendar is missing. This is a licensed user, and other users can be granted access just fine. See below.
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Outlook | Windows | Classic Outlook for Windows | For business
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Vasil Michev 119.7K Reputation points MVP Volunteer Moderator
2023-06-10T06:53:48.5133333+00:00
1 additional answer
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Faery Fu-MSFT 19,751 Reputation points Moderator
2023-06-12T09:08:55.7033333+00:00 Hi @Tanner Umbower ,
Permissions that can be granted are different for people inside and outside the organization.
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