Your app can't checkout. I am using pixel 6 and when it gets to submit order, it redirect to a view asking sign in again. Fine, re-entering all info again but the thing is it ask for confirmation and the radio buttons are not clickable. Also, if you go back and forth the pages changing checkout method, coupons will drop from summary even though they are saved. Tell your dev don't just do testing on desktop. Your checkout process requires too much steps.