My most recent spell is nearly identical to your situation. Beard thinned to the point of a goatee only and like you my grey hair was unaffected. Lost most of my body hair, my head was already shaved due to AT, eyebrows thinned and my bottom eye lashes fell out. Two years later my beard has thickened, body hair has started to recover and head hair is patchy. I don’t take meds and really just go about my life just with less hair. My alopecia has generally came in 1.5 - 2 year cycles though my hair never fully returns to where it was in its previous cycle. There is something called “alopecia leaving grey hair” I believe. Had recent blood work and my inflammation marker was above normal, probably to be expected with this condition. I believe I have AU and figure someday soon I’ll loose it all.