Originally Posted by
Enigma368
I don't think this explanation is accurate. Theres some system problem more likely the cause imo. Esp when United is showing EI award availability that BA/avios.com is not. Probably the agent you spoke to was just making stuff up.
United awards may be coming from a different bucket. Short haul United awards tend to book into T. They also cost roughly 3x the price in miles (though you may value Avios higher than United miles)