Mailbox Created in O365 Admin Page Not Showing On Premise

Hi,

So all of our current O365 users have been migrated from on premise mailbox's. Although we have had a few hiccups this has gone overall relatively smoothly. We are running in a hybrid environment and our dirsync is currently working fine.

Last week I created a mailbox through the admin page in the O365 portal. The mailbox has created fine and logged in to login.microsoftonline.com I am able to send and receive e-mail. However unlike with the migrated users, outlook 2013 does not automatically find the mailbox. I have looked and I can't find an on premise object in our Exchange Admin Center, which I assume is the reason for this. In the EAC when I click on the Office 365 link in the top left corner and log in I can see all of our O365 user mailbox's and this user shows in there.

When I try to change the reply address on this mailbox I get the following error:

The operation on mailbox "" failed because it's out of the current user's write scope. The action 'Set-Mailbox', 'EmailAddresses', can't be performed on the object '' because the object is being synchronized from your on-premises organization. This action should be performed on the object in your on-premises organization.

This seems pretty self explanatory in that it is still synchronizing, however I have had this message since the mailbox was created which suggests to me that something is wrong.

I would just delete his mailbox and create a new Office 365 mailbox in the on premise EAC however when I select his mailbox in the O365 Admin portal I can Add to Group, Edit and Reset Password, but delete is not clickable (I have checked with another and it is). I assume this is just due to the state that the mailbox is currently in but I still suspect there is a problem.

I assume there may be a way to connect with powershell and delete his mailbox, or some logs or other information to check somewhere that I may not know of. I am relatively new to the Administration side of this.

Thanks,
AlisterHillAsked:
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Gareth GudgerConnect With a Mentor Commented:
Hey Alister,

Yes, in a hybrid environment you would want to create the mailboxes on the EAC on premise side. That is strange that you can no delete it though.

Check this article, because it sounds like you don't have Rich Coexistence enabled and I believe this would solve your problem.
http://support.microsoft.com/kb/2406830
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AlisterHillAuthor Commented:
Time and precise answer, with a relevant link provided.
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Gareth GudgerCommented:
Glad to help!
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