Kicked off of Roaming while deployed

Hello all

I am currently deployed to a location in the middle east, and I have the Magenta Max Military plan.  Initially, I was able to use mobile data for roaming, but now it seems I have 0 connection and it constantly says "searching."  My WiFi availability is VERY spotty, so I really am trying to rely on the LTE for text messages (for 2FA) and other things.  I started to notice that whenever I was connected to a vodafone network, I would get kicked off shortly thereafter.

My job requires me to have 24/7 availability by phone, so this situation is leading me to miss critical phone calls because I simply don't notice that I've been kicked off the network until I check my phone.  What am I doing wrong here?

I'm on a Samsung Galaxy S24.  Now when I am trying to connect to the network (even after restarting my phone, resetting network settings, turning mobile radio on/off), I just see a "DENIED" status under Data Raw Registration State and Voice Raw Registration State.

Please help, I thought I'd be able to rely on international roaming with T-mobile to maintain connectivity.  I really don't have to have to purchase an additional sim card for the area.