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Unable to add a room calendar in a meeting request "You don't have permission to send to"

Background: Hybrid Exchange ONPREM Exchange 2016/Office 365

Users are all Office 365, Room Mailboxes are ONPREM

All conference rooms work fine except one I will call it ConferenceRoom1

When I add this conference room to a meeting in Outlook, I see the MailTip: You don't have permission to send to: ConferenceRoom1 

If I continue anyway and send it I receive a bounce back

Delivery has failed to these recipients or groups:

Falcone Room (ConferenceRoom1@domain.com)

Your message couldn't be delivered to the recipient because you don't have permission to send to it.

Ask the recipient's email admin to add you to the accept list for the recipient.

For more information, see DSN 5.7.129 Errors in Exchange Online and Office 365.

Diagnostic information for administrators:

Generating server: IA1PR09MB9456.namprd05.prod.outlook.com

ConferenceRoom1@domain.com

Remote Server returned '550 5.7.129 RESOLVER.RST.RestrictedToRecipientsPermission; not authorized to send to recipient because the sender isn't on the recipient's list of senders to accept mail from'

again, only this room as issues all other rooms are fine

This is a room mailbox

Issue happens when using Outlook 2016 or 365 versions






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Answers (1)

Posted by: barchetta 3 weeks ago
2nd Degree Black Belt
0

You are in the wrong forum.. but, if I were you, Id look at permissions for the room and if something didnt jump out Id simply delete it and recreate it. Time is valuable.

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