Unable to PVP with upgraded hero (wildcard plus valor)

I upgraded Grommash for the wildcard slot and then used Valor to upgrade it.

Whenever I try to rumble in pvp with this hero, the game gives me “We are unable to verify your account details. Check your login information and try again”

I can do everything else and engage in pvp with every other hero, just not with the upgraded Grommash. Obviously a bug.