Originally Posted by
PTahCha
Well, this is from Terms and Conditions:
If you wish to make changes or cancel your Star Alliance Upgrade Award request, please contact the operating carrier.
However, sounds like you might need to do a 3-way conference call to get everyone aligned.
Think that only applies to cancelling the upgrade but not the reservation for the flight.
However, getting *A upgrade miles back on fully canceled reservation has been hit & miss in the past -- the operating carrier needs to release the miles. But UA is the right place to start and the OP mentioned the uoerating carrier claims to have released the miles.