Just got on the game. Tried migrating the EXP, the values showed up and I accepted them, migrated the achievements too.
Went into a Minigolf game, my EXP is gone by my achievements are not. When trying to migrate EXP it kept saying something about AGC.
My friend was able to get his EXP though so I am unsure what happened.
the AGC is the backend system which now stores your EXP, so it makes sense that your EXP wouldn’t migrate properly if the game was saying something about it. Your old EXP values are still stored on Steam so nothing’s lost, I’m not sure if there’s a way to manually do the migration again but I assume the developers could do that.