An answer in cases such as these, had been suggested to acquire an external
USB cam (with microphone?) to use instead of the low-resolution built-in one.
Issues such as this had been known to mac users who've visited discussions online
in the past year; some had used advance warning to consider other options. A few
bought other models, or stayed with an older product that worked adequately.
Depending on where the product was bought, the opportunity to return within
14-days of initial purchase ~ appears to be valid only those from Apple directly;
and not a policy of those bought from 'authorized independent reseller' outlets.
While my older portable Macs are doing OK, they're not put upon for newer tasks.
Good luck & happy trails!🌿🌞🌤🐝🎣🐢