Originally Posted by
caliform
Good lord, that is infuriating.
As for you, OP, as someone who is also smashing through tiers during travel this year, I recommend just talking to the SkyPriority check-in counter. Delta can fix this by removing and re-adding your FF no from your PNR, which isn't always possible for us lowly delta.com users.
According to DL rules, you cannot change the FF number associated with (any flight on) an itinerary after you have boarded the first segment. Hence, this will be more of a problem if your status changes in the middle of a trip. In this case, the remove and reenter the FF number trick is not a do it yourself project. You'll need to talk to a good agent.