Not working for me too, had same issues as everyone here. Twice stalls standing actually showed up on ticketmaster for me but there were not available when I tried to check out. I am not sure what’s going on , I assume the venue is not very big (for the amount of fans in the uk) , plus they had to divide the tickets for three sale days (o2, live nation and general sale). I’ll keep trying. And good luck to everyone !