Had an interesting one last month. Was flying VAR-IST in Y and at check in they couldn't get my Elite status to show on their system or my BP (showed them my digital card on the app) and they couldn't decide how to get me into the lounge. The check in staff decided an upgrade to J was the easiest option, which was of course fine with me!
Airline: Turkish Airlines
Route: Varna (VAR) - Istanbul (IST)
Booked cabin: Economy Class
Upgraded cabin: Business Class
Number of passengers: 1
Miles&Smiles level: Elite
Booking class: W