Indeed. Waitlisting for an upgrade ex-North America seems to be hopeless at least post-pandemic. You're better off setting an expectation that you'll only find out on the day you fly. At LAX, they still ask people requesting a mileage upgrade fill out a paper form (in 2022!) at the check-in desk. Then after check-in has closed, they will consolidate all the forms and then let you know at the gate if you got the upgrade. Suspect they decide who to upgrade based on status priority.