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Unable to open OWA cross site between 2013 and 2010 Exchange Server

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Hello,
First of all allow me to describe the scenario as this always helps and is often omitted from many questions.
 
SITEA – 1 x 2010 Exchange Server (All roles except UM and Edge), Domain controllers etc available
SITEB- 1 x Newly installed 2013 Exchange Server (Mailbox and CAS roles), GC Domain controllers etc. avaliable

Sites and Services are correctly configured between the sites and we have a high speed WAN connection between the data centres all ports and communication between servers at both sites are open as the connection is secure. 

After installing Exchange 2013 in SITEB, whenever I try to login to either the ECP or OWA of the 2013 with a user whose mailbox is in SITEA we immediately receive the sad smiley face with the something went wrong message. Clicking more details displays the following message:
X-FEServer: <OUR_EX_2013_SERVER>

I was expecting Exchange to proxy the request to the 2010 server and get the 2010 OWA experience. If I create a new mailbox on the 2013 then it is of course fine. 

Is someone able to suggest any troubleshooting steps? I have of course fully followed the Exchange 2013 deployment assistant from Microsoft and ensured all pre-requisites were carried out. 

The Exchange 2013 server is SP1 and is running on Windows 2012 R2


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