Same person but under my own account with my Ultra. I see people's posts going back a week saying they were told the program was full but I was able to enroll and update yesterday evening. Maybe it's only closed out for the regular S20 but still available for the Ultra? I have no idea regarding the S20+ if someone with an S20+ could post an update if the program is still available to them.
I must've gotten lucky yesterday; I'm happy that I was able to get OneUI 3.0 on my ultra but annoyed that I actually like it since it seems that they've closed the beta program and I can't put it on Blackvelvetcupcake's phone, not to mention seeing other people in the forum are unable to get it as well 😕