I supposed I'll have to come out of pandemic hiding and visit an Apple storer... store!
Call first. Many Apple stores are also in pandemic hiding and simply getting an appointment within less than six weeks is practically unheard of.
⚠️ Reread Leroy's last post for the information on shipping the computer back to Apple. It may be the only way to get it repaired in short order. That repair is usually not done in-store even pre-COVID as it requires a new upper deck with the proper keyboard localization. Too hard to inventory all the variants.
If dropped off at a store, they will have to ship the computer to the same central repair depot to which you can ship. More time away if you make them a middleman.
HOWEVER....first try a long shot that can sort some keyboard issues: the SMC reset, Instructions here:
How to reset the SMC of your Mac - Apple Support
Your computer model has the T2 security chip so use that instruction set.