Switch Multiplayer cabin mail broken

[LibbidyBibbidy]

My friend and I have been playing on a farm since switch got 1.6, and now her mail won’t progress past Robin advertising the house upgrade. We’ve quit the game and come back, she’s closed and reopened the game, I’ve played alone before her coming back. It’s still stuck on Robin.
I want to say it was after I moved her cabin (as I saw some others had the problem after moving the cabin) but honestly I don’t remember exactly.
Obviously, she’s missing out on a lot of mail because of this, and I’d like to fix it if we can.

 

[Nexangli]

Me and my wife are having the same issue on PC split-screen. we've even upgraded her house and downloaded a mod for the mailbox view and didn't fix it. sadly didn't work.