Once the schedule is posted by Federal Labor Law they have to ask you if it’s ok to change your posted schedule. If not they can get in trouble

(Do you have the schedule app SBUXPartnerHrs) cause if you do, that then leads to the question are you open on that day? Though it is a courtesy to ask usually, it’s mostly for unavailable days. If your open on that day or you previously stated your open on certain days of the week, it’s usually kosher to punch you in for days u say ur open. If not on the app, then just communicate you like to be asked first before being added unless they are a total shitheel, they should understand