Like the title says. I cant hear my teammates unless i minimize the game. Been like this all season. (LG G8)
Also if you minimize the game from between loading into a match or back into a lobby, the mic will keep working. Sometimes I would be on other apps and I still see the mic icon on top recording.
This is most likely because of party hub still being open. You should be able to continue to speak to your party if using party hub outside of playing Fortnite.