Note 4 and just gave up and reinstalled... My Google plus progress is still there yet the game is at level 1. Rovio once again has screwed over the game
I emailed Rovio & got a response. They're "sorry for the inconvenience" & are "investigating this issue & hope to have it fixed soon."
Same problem you stated in the OP. You'd think if they were gonna force you to use "help" from other players, they'd have something like Facebook connect figured out.
Really not very impressed with their idea of "multi-player." still waiting on live multi-player for Angry Birds Go!