An Office 365 user tries to share their calendar with an on-premises user or an external user. Or, an on-premises user tries to share their calendar with an Office 365 user or an external user. In either scenario, the user who tries to share their calendar to the cross-premises user receives the following error message:
Policy does not allow granting permissions at this level to one or more of the recipient(s). Please select another permission level and send the sharing invite again.
This problem occurs if the sharing policy doesn't allow the user to share the level of detail that the user set in the sharing invitation.
To resolve this problem, follow these steps:
Do one of the following, as appropriate for your situation: