Recipient SendAs:You can't use the domain because it's not an accepted domain for your organization

Question

Issue:&nbsp; &nbsp;While Setting Up Send As Permission for an Office 365 User on On-Prem Exchange 2013&nbsp;Mail Enabled Public Folder, I am getting the following error
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Verified Information:

&nbsp; &nbsp;Verified accepted domain on both the ECP
&nbsp; &nbsp;Removed invalid domain (domain.local) entries from Mail Enabled Public folder and also&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; verified users from O365 has the same entry.&nbsp;
&nbsp; &nbsp;Mail Enabled Public Folder Contacts are synced almost everyday using&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;(SyncMailPublicFolders.ps1) script&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (https://blogs.technet.microsoft.com/undocumentedfeatures/2017/04/08/migrating-hybrid-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; public-folders-to-office-365/)
&nbsp; &nbsp;Verified the Mail Enabled Public Folder Contacts in Office 365 and the Email address entries

References Related to the Issue:&nbsp;https://support.microsoft.com/en-us/help/3067179/-hybrid-domain-domain-isn-t-an-accepted-domain-for-the-cloud-organizat
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Please Assist&nbsp;

vasilmichev · Answer

Cross-premises Send As permissions are NOT supported. Yet. And you cannot use the contact object representation in O365 for permissions.

sujith suriya · Answer

Please refer the below article
https://technet.microsoft.com/en-in/library/dn249373(v=exchg.150).aspx
Using the above article we have already implemented and also we are syncing the mail enabled public folder to exchange online using the below link
https://blogs.technet.microsoft.com/undocumentedfeatures/2017/04/08/migrating-hybrid-public-folders-to-office-365/
After the above setup, we are able to give send as permission on mail public folders to the users, but now we are facing issue only on a particular mail enabled public folder and the error is quite irrelevant&nbsp;
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vasilmichev · Answer

Syncing the (ME)PFs is very different from migrating them, actually is just one of the many steps you need to perform for the actual migration. As you can see in the article, those permissions are added only after the PF are migrated. Not synced, migrated. So perhaps you want to clarify on your current&nbsp;setup?

sujith suriya · Answer

Not Necessarily,&nbsp; See we have our users in our on-prem exchange server and Exchange online as well, we are not migrating our public folders to exchange online&nbsp;for now&nbsp;but instead we&nbsp;are syncing public folder AD objects to exchange online so that users from Office 365 can identity mail enabled public folder. This is how been set up in our environment and now we are facing issue with one public folder.&nbsp;
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See the below screenshot for reference
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the above script is to give send as permission mail enabled public folder for an Office 365 user

sujith suriya · Answer

you are right, but i am referring to syncing but not migration. even in AD Connect newer version we have this option for syncing mail enabled public folder exchange.
hope you understand my issue from my previous post and this one&nbsp;
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please assist.

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Recipient SendAs:You can't use the domain because it's not an accepted domain for your organization

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