Rusty chain after a week outside: save it or bin it?

Make sure the wheel is seated fully in the dropouts.

Marking this one to follow, same issue here.

Check the simple things first: tension, limit screws, and that everything is tight.

Had exactly this. It turned out to be the cheapest part in the whole system.

Bring it on Thursday and we will have a look together.

A drop of grease on the threads fixed mine.

Take a short video with the sound on, it helps a lot with diagnosing noises.

If it is under warranty, go back to the shop first.