It is mentioned under the Mailbox permissions and capabilities NOT supported in hybrid environments section of the article "Azure AD Connect doesn't automatically synchronize Send As permission between on-premises Exchange and Microsoft 365 or Office 365, so cross-premises Send As permissions aren't supported."
It is also mentioned under the Mailbox permissions supported in hybrid environments section of the article "A mailbox on an on-premises Exchange server can be granted the Send on Behalf permission to a Microsoft 365 or Office 365 mailbox, and vice versa."
Note:
It is also mentioned under the Mailbox permissions supported in hybrid environments section of the article "A mailbox on an on-premises Exchange server can be granted the Send on Behalf permission to a Microsoft 365 or Office 365 mailbox, and vice versa."
Note:
- Shared Mailboxes has Full Access (Read and Manage) and Send As permission whereas User Mailboxes has an additional Send on Behalf permission
- Article in the discussion, Permissions in Exchange hybrid deployments | Microsoft Docs
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