Are you still within Apple's return period? If not, you could sell the machine, take the loss, and buy another machine which which you would actually enjoy. Life is short. Lots of people don't make videos or do zoom etc and may not care about the limitations of this model. It sounds like you purchased this machine fairly recently, so hopefully the loss wouldn't be too bad.
You could try calling Apple and aiming them at the above link on their own site which demonstrates that other users of this model have had the same problem. I found that link in 2 minutes, you could likely find a number of other similar pages. This may help if they take the "what are you doing wrong?" approach. If you are polite but very persistent you might be able to negotiate an exchange.
As best I can tell from the link I shared above, this is a limitation of this particular model so, if true, there's probably no way to fix it. If that's the case then your choices would seem to be:
1) Negotiate with Apple.
2) Sell the machine and make peace with the loss.
3) Keep the machine and make peace with the loss.
4) Replace the camera?
5) Buy an external webcam and use that instead?
It's possible you could recoup your loss by replacing this machine with a used machine. You know, if you could sell this one for $900 (or whatever the going rate is) and buy a used machine for $900 that doesn't have this problem, then you've traded new for used, but you haven't lost any money.
We haven't bought anything new from Apple in twenty years. All of our machines are used. Here's why.
1) First, obviously used is cheaper.
2) You can get a lemon when buying new and when buying used. If you get a lemon it's more fun when it costs less. The idea that new is more reliable may be an illusion, it has been in my experience at least.
3) When you buy an older model you have the opportunity to do some google searches before the purchase to see what experiences other buyers have had with that model. If a particular issue is reported repeatedly, and that issue matters to you, then you can avoid the purchase and keep looking. This is harder to do with the latest models.
Sorry for your loss, and I hope something in there helps.
PS: This typed on a ten year old 27 inch iMac which I do tons of video work on.
