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Jennifer-3804 avatar image
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Jennifer-3804 asked Jennifer-3804 commented

After migrated a shared mailbox to the cloud, on prem user are unable to access it even they have the right permission

Hi Team,

I need assistance on this, after we migrated a shared mailbox to the cloud, on-prem users are unable to access it even they have the right permission . We tried creating the remote mailbox " New-Remotemailbox -Name "Shared mailbox" -Alias sharedmailbox -UserPrincipleName sharedmailbox@contoso.com -Remoteroutingaddress sharedmailbox@contoso.mail.onmicrosoft.com -Shared "

But got the following error msg : The proxy address "smtp: ...@....mail.onmicrosoft.com" is already being used by the proxy addresses or
LegacyExchangeDN of "fcbancorp.ent/Accounts/nonUser mailboxes/...". Please choose another proxy address.
We are running exchange 2016 .

Thank you in advance for your help.

office-exchange-hybrid-itpro
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You wouldnt need to create a new remote mailbox, thats created automatically when the mailbox is moved to Exchange Online.

What permissions do the on-prem users have to the mailbox? can you Remove and re-add them?

What client is being used?




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@Jennifer-3804
Any update about this thread now?

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Removing then re-adding the permission solved the issue.

Thank you guys!

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1 Answer

KyleXu-MSFT avatar image
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KyleXu-MSFT answered

@Jennifer-3804

There has some limitation about permission in hybrid, you can have a check about this article: Permissions in Exchange hybrid deployments

If there still exist issue, could you provide more detailed information about it? Such as, issue occurs on which permission, what is the detailed error message.


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Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total.