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We migrated a few users to exchange online. Hybrid Deployment. Exchange 2013 on-premises servers. Using aadconnect. We are not able to grant the migrated users permissions to any on-premises calendars. When I logon as an on-premises user and try to give calendar permissions to the migrated users I receive the following error: "non-local users cannot be given rights to this server". Also, the migrated users are showing red slashes in the GAL, cannot make appointments and cannot see free/busy on the calendars.
How do I correct? Thank you.
Cross-premises folder-level permissions are not supported by default. Follow the steps in this article and the references therein to enable support for delegate scenarios: https://learn.microsoft.com/en-us/exchange/hybrid-deployment/set-up-delegated-mailbox-permissions
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