I'm having the same problem. Played back around when Arena first came out, quit for a year or so, and just got back into it again yesterday. I managed to do all of Blue no problem, but then once I went to my second color to do, I could do the first 4 battles only and the PVP-finding one had this issue. I since checked each individual color since Blue worked, and none of the others did. As it sits, I'm 4/5 for everything but Blue due to this error.
Windows 10 OS, running 21H1 update. No problems finding PVP games outside the Color Challenge, only met with the "Waiting for the Server..." message in the Challenge.
I'm having the same problem. Played back around when Arena first came out, quit for a year or so, and just got back into it again yesterday. I managed to do all of Blue no problem, but then once I went to my second color to do, I could do the first 4 battles only and the PVP-finding one had this issue. I since checked each individual color since Blue worked, and none of the others did. As it sits, I'm 4/5 for everything but Blue due to this error.
Windows 10 OS, running 21H1 update. No problems finding PVP games outside the Color Challenge, only met with the "Waiting for the Server..." message in the Challenge.