Hey all- Not to hijack but have a question along these lines- I (like a million others) make 1k this year with some pretty pitiful dollars spent (Sorry everyone)

I thought that even without PX inventory Y and B and sometimes M fare are automatic upgrades for 1k's. Has that stopped? Had to book a B class flight and didnt get upgraded. Is that only when PZ fares are open? How do I look to confirm a YBM fare will clear in expert mode?