Amazon SDE-2 interview experience

Recently gave amazon interviews for theirs ads team. My DSA round with LP went good and the lld and hld round also went fine as i was able to come up design in HLD covering metric’s monitoring and fail safe and in LLD i was able to cover p0 and p1 requirements. Got rejection after 4 days and recruiter said HLD and LLD rounds were not upto the mark. Folks i wanted to check where did i made mistake? I checked with interviewer also if he/she is fine with what i was suggesting and they were okay with it