FWIW, I just OLCI'd for DEN-SFO tomorrow AM. My UG had not cleared and there was only 1 open F seat. I changed my FF# from MP to my TK *G account and saved the change. My exit row 21C stayed without a problem. OLCI went normally and my BP reflects the 21C, my TK *G and Boarding Group 2. The change to TK did boot me from the Upgrade Standby list as my name was missing from the list. I'm OK with that as I'll wait for a real breakfast in the CX lounge. Hopefully the exit row assignment will hold.