This has been an issue with Virgin for well over a year. It has (sort of) been acknowledged as a problem but they are taking ages to resolve it. Things got so bad that I had no choice but the leave them!
TBH, this is pretty poor. Since Covid Vaccination invites are being send out by SMS and people are currently being instructed to stay indoors I could miss my invite or may already have done so. I can't by the only one in this situation either.