There's your problem. The UA MP numbers are three letters + five numbers. Is your third letter a capital O and you thought it was a zero?
My MP number is WV4*****
My wife's number is WJN + (five digit number)
My daughter's number is WTC + (five digit number)
I enrolled the program in 1994 with Korean address. My wife and daughter started the program using US address. Do you think this is the reason for three letters vs two letters?