You can’t eUp from Standard to PY. You can in some of the alphabet soup options of Flex but the list of fares drops from 5 to 2 (MU) if you are below E50k.

I can’t see / recall what status level the OP has here, but felt this salient for any future readers. Personally I was unable to even request an eUp as an E35k as I was booked into H.

Of course AC is more than happy on the once again extended promo to upgrade you to J if you have R space, 21 credits and $600-$750 copay depending on exact fare from Standard.