What could cause all of our shared mailboxes to have "Cannot expand folder?"

We have a multi-domain office 365 account with multiple shared mailboxes on different domains with the same prefix.

eg. ap@yahoo.com, ap@yahoosistercompany.com, ap@yahooparentcompany.com

The issue is anytime we try to do these types of mailboxes and then add the mailbox to out look we get the error cannot expand folder.

Any ideas?
chazzwillie15Asked:
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sunnyc7Commented:
You would have to give full mailbox permission to the shared mailbox.
there's a guide here.
https://community.office365.com/en-us/f/148/t/167084

hth
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chazzwillie15Author Commented:
I have seen this recently w/ office365 shared mailboxes not opening correctly as well. It started last week when office365 had a large outage.
It appears to be an automapping issue. I would open a case with Microsoft, however If you would like a temporary workaround, disable automapping for the shared mailbox. You'll need to do this within powershell. The command would be as follows:

1.) Add-mailboxpermission -identity <sharedmailbox@domain.com> -user <username@domain.com> -accessrights FullAccess -InheritanceType All -automapping $false

If the mailbox has full access already set, replace "add-mailboxpermission" w/ "Set-mailboxpermission.

If that still doesn't work, remove full access all together, then re-attempt step 1.   You could also use the command:
 Remove-mailboxpermission -identity <sharedmailbox@domain.com> -user <username@domain.com>

*You will need to add the mailbox manually, by going into account settings, double click the account, more settings, advanced, then "add"

To do this on a larger scale, see https://technet.microsoft.com/en-us/library/Hh529943(v=EXCHG.141).aspx

Hope this helps. Just know that this is likely effecting many people.
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