I have a Lumina 929 and had the same issue trying to synch to FB. I was high level 6 ready to make the jump to 7 and figured I should finally back up my progress to FB. FB Synch attempt crashed my game and I ended up losing all progress and having to restart from scratch. They do know about this problem. Recommend dropping a ticket to support anyway. they will want phone info so they can work on finding out why this is only affecting certain phones.
Officer ImperialNWA Andriod / IOS Imperial Squad. If you are a new / developing player check out our developmental squads ImperialNWA_II and ImperialNWA_III. LINE ID is python6swc
I have the same problem with a Lumia 920 (level 9) and 520 (level 8). I don't want more problems with this game and i will unistall the game. If it can sincro with FB, why do they implement the option?.