Pixel 2 roaming problem

pixel2user

    I have a pixel 2 and use T-Mobile one as my plan.  Everything is set up for international roaming on my account, but when I travel abroad I do not get access to a local network.  I have called TMobile and they said they won't help because they do not support the pixel 2 (I bought it from Google directly).  I assume it is an APN setting, but I can't figure out what to change.  Can anyone help?

     

    Thanks

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