Ok so I just received my Spark from DJI Care Refresh and when I went to pair it with my remote I discovered that the customizable button is broken. It doesn't "click" in like all of the other buttons. I had the controller paired with my broken Spark, and I never used that button except to pair the initial time with it... My question is is there any alternate way to pair the controller to the Spark? I really don't want to use a second Care Refresh or buy a new remote just to pair this new drone one time.

We are sorry to read on your difficulties, please refer to the tutorial video below to link RC via DJI Go 4 APP:
Please note DJI Care Refresh of Spark doesn't include RC and the warranty period of RC is 12 Months, if there is a hardware damage, please send in for repair service, thank you.