Connecting to Ultimate Team is not possible at the moment

After that, I always get a message when logging into UT - "Connecting to Ultimate Team is not possible at the moment. You will now be returned to the Main Menu"

I found the problem. It's IPv4 routing to the servers. When using IPv6 tunneling, everything stays good and you can play in all game modes. However for me program, that gives IPv6 tunnel, work only with VPN, the ping increases from 60 to 95, which is very uncomfortable to play with. Maybe for you this program will work without VPN, you can try, just find Cloudflare WARP.

'Connecting to UT not possible at the moment' | EA Forums - 12869767

please check out this post made during gauntlet 3. EA never fixed this issue, I was only able to log back in when gauntlet 3 mode ended. This is why I never attempted playing gauntlet 4. Keep reporting this issue to EA it is an account issue caused by gauntlet mode it is not an internet or console issue. 

I don't think this problem is related to that. I tried logging in from another account, and UT runs without any problems there.

For me it's exactly bad IPv4 connection, because when I start play through IPv6, I didn't have no one disconnect to servers.

Check my post this is definitely not a server connection issue. You can use another ea account and connect to UT fine on the same pc or console using the same connection