FYI for MM companions traveling soon...
I called Premier CS and in the auto system, cited significant other's MP#, then asked for "Mileage Plus", then asked for "agent" and "agent queue". No wait, got Jeffrey, and he set things straight for me. I'm traveling on 3/11 and I told him my status was shown as approved after nominations in Oct/Nov. I explained we were both told in Jan that it would be effective 3/3 and that it has now been pushed back and we were concerned because we booked all these tickets for me to travel by myself and I didn't want to pay bag fees, etc. He put me on hold, clickity clack, and in 5 minutes, changed my status to reflect my significant other's for the MM companion sponsorship.
DONE deal!!! I'm so thrilled. So, if anyone is in the same boat, try that. HTH!!!