TSE Server 2012 join farm 2008.

Hi,

I'm currently tring to add a TSE server 2012 r2 to a TSE farm 2008r2.

I got a broker in 2008r2 and i have followed this procedure to add the 2012r2 server into the farm : http://technet.microsoft.com/en-us/library/cc772418(v=ws.10).aspx

The thing is, my broker redirect me to both 2008r2 TSE server which are in the farm, but not in my 2012r2.

Are those thing compatbile ? Is it possible ? Any log or thing i can check to know why its not working ?

Thx for your help