Well firstly there was a new client that released yesterday. Also sometimes windows 10 has issues and those are detailed in https://pokemonrevolution.net/forum/viewtopic.php?f=89&t=14738 . Sometimes I have issues with it not coming up with the que, I normally just have to wait and be patient, click join a few times, and close the client if it isn't working. I hope you can have this problem resolved.