Thanks for the responses. The main reason for flying UA was to maximise my Star Gold status, and given that I’ll be travelling less for work this year so wanted to use personal travel for re-qualifying. DL/VS through ATL and AA/BA through MIA do indeed seem better options at the moment though.

Thanks for checking the various options and whilst it is good to see that I am not just doing something wrong when putting in the details, it does seem a very odd situation.