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You challenged stunner047 in Stadium OU, not RBY OU, and thus the set is invalid. Please re-challenge them in [Gen 1] OU. [Gen 1] Stadium OU is is used for the Stadium Open.
Opponent said Tuesday and Thursday worked, but did not give his timezone, did not respond to my messages either day, and did not offer up any times that would work for him either day. Going to try to re-schedule a proper time for next weekend, but if this continues, activity.