T-Mobile LTE Redirect Issue: B525 Modem, Domain sso.t-mobile.pl, Frequent Disconnection & Xbox

Hello

I have a b525 modem and have had problems with connection / internet redirection for some time? When I try to open the pages, a notification pops up saying the phone number (photo below) and entering the code received via SMS. After entering the code from the text message, the notification appears while browsing the pages (up to 5 times a day max). It's a bit of a pain, but worst of all, when you try to play xbox games online, it completely crashes the internet from your console. The gentlemen from T-mobile do not know what the problem is and the only advice they received was to restart the modem, which did not change anything.
Thanks in advance for your help.

For me, such a page appears sometimes when I turn on the modem and it does not have time to authorize itself in T-Mobile (I assume), and I try to open a page too quickly. I wait about 15-20 seconds, then refresh the page, which already opens normally and I don't have to enter any code.

IMHO just disconnects you from the internet sometimes and this page shows up when you reconnect. Once you see it, try waiting for 3 minutes, close and reopen the browser. The page still shows up?