In a Microsoft Exchange Server 2019 or Exchange Server 2016 hybrid environment, you deploy modern public folders on Exchange on-premises. When an online mailbox that is the owner of an on-premises public folder (for example, onpremPF) signs in to Outlook, and tries to assign permissions to an on-premises or online mailbox for the on-premises public folder (onpremPF), the permissions can’t be applied.
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