EUFY Floodlight Cam 2 Pro 4g issue

Hey all, I have 3 of these cameras and they have been working perfectly for 2 years. We upgraded our router to the ASUS GT BE98 and now whilst I get WIFI in the house for the cameras, when I am out of area I get nothing. Mobile Data is on SIM card is 4g enabled etc etc.
Have tried a few things but nothing seems to work
Any iades what to do ?