ATED Agent Registration

Has anyone managed to get this to work recently? It asks for Business Type, Agent Name and UTR. We filled in our partnership details and it gives an error message saying not recognised! It has proved extremely difficult to try to track down someone to speak to about this - have tried at least  4 different numbers so far - 2 of the 4 had not even heard of ATED. So we have hit a brick wall!!!

Any suggestions?