I would encourage you to send in a ticket about this. I tested this twice today and I was able to log in with both my son's Samsung A20s and my Xiaomi Mi 10T and experienced no issues.
Recently, I have been having trouble connecting when I'm in different places. I could have four bars and the signal is on, but I still get the no connection symbol. I let it sit for 20 minutes like that with no luck. I can get in at home, but not other places where I usually have better connection. Mine's a Samsung tho...