It doesn’t work for me either. I have tried everything but nothing ever comes out my earbuds. It’s kind of annoying because I have to keep testing by it by starting workouts after I change a setting. I’m on a 16 max, series 10 with beats earbuds. Workout buddy never works.

My Battery drain is not as bad as OP but my brand new series 10 watch is definitely battery draining noticeably faster than before I updated from 18.5.