Ok, this is so embarrassing, I can't believe I did it. I made sure to link CO OP and UA MP account for about a dozen people among my extended family and friends, and I COMPLETELY FORGOT TO LINK MY ACCOUNTS!! So now I've got two MP accounts (one with my work address, the other with my home address). I also have a brand new Explorer Visa, and I have no idea which account it's linked to (probably the new MP account, since I used the old MP number to apply). So, what now? Call MP once I have a PIN for each account, and have them consolidate both accounts, then kill the MP account that has my old OP number?