You both have to be in Live at the same time to play a Live game: Play > Live
Your friend also has to have setting set to allow your challenge.
How to invite someone watch as a guest when playing on blitz?
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not to play against my friend, but my friend to be able to watch my match with an other player i am against
As the title says i want to invite my friend when i play a game on blitz for like 5/5 game or whetever that is just giving him the link it doesn't work.