Manchester United's Champions League return ended in disappointment as Harry Kane struck from the spot for Bayern Munich in an entertaining 4-3 win kicked off by Andre Onana's clanger.
The European heavyweights are at very different stages right now, with the perennial Bundesliga champions second favourites to win a competition that the Red Devils did not even feature in last season.
Absentee-hit United began brightly enough at the Allianz Arena, only for Serge Gnabry to score shortly after ex-Manchester City forward Leroy Sane's effort squirmed past summer signing Onana.