Exchange 2010 to 2013 action cannot be completed the name cannot be matched to an address book

I'm having issues in a migration environment. I am moving mailboxes from 2010 to 2013 and I'm having issues reaching outlook externally. I have rpc over http all setup and the mailbox passes all checks on testconnectivity.com. But when I am external from the network I get the error "The action cannot be completed. The name cannot be matched to a name in the address list. I verified there are no weird MDB entries in ADSI edit so I'm not sure why this is an issue.
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MarinertekAsked:
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Jason CrawfordTransport NinjaCommented:
Open EMS and try this:

Get-Mailbox <mailbox alias> | fl HiddenFromAddressListsEnabled

Open in new window


If it returns True you found the culprit.
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MarinertekAuthor Commented:
It returns false,  thats one of the things Ive been looking at.
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Jason CrawfordTransport NinjaCommented:
Only thing I'm coming up with is make sure any lingering .ost files on the computer you're working on have been deleted and use ADSI Edit to check the shownInAddressLists attribute.  Other than being hidden that's all I've ever encountered...at least that I can remember.
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MarinertekAuthor Commented:
I was able to resolve this after I got the autodiscover working. For some reason accounts that were manually configured externally were not working properly. Thanks for the help!
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MarinertekAuthor Commented:
I was able to resolve this on my own
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