This bug went away but I tried for over half hour before screen capturing game and writing up bug.
I cannot challenge in Tower of Fame anymore.
I have full challenge tokens, I challenged yesterday I have challenged before many rounds and challenged does not have any W/L vs me. I try others and get same response. I tried restarting Browser (Chrome) same issue. I have no issue doing this from nutaku account on game here. I can do everything but Tower of Fame.