Chosen Solution

Seemingly out of nowhere, the B key on my keyboard is giving me trouble. It has not stopped working outright, rather it works only when pressed specifically in the upper left hand corner. Pressing hard on any other part of the key does nothing. Is there a setting that does this? Are there multiple sensors on the keys?

No there is only one switch element. Apple has a known issue with the new butterfly keyboards used in this system. You’ll need to get your system to an Apple Store to have them replace the keyboard. Frankly, it should be covered under extended warranty but it’s not presently. Ideally, you want to have AppleCare + as its quite expensive.