Ok solution found:
-Enable developer tools and usb debugging
-Connect after enabling and drivers should be installed on the PC
-Download Android SDK tools
-Extract and open CMD in admin mode, and go to the tools directory
Then run:
adb shell settings get global tether_dun_required
If the result is "null" or "1" run:
adb shell settings put global tether_dun_required 0
then reboot phone
Verify setting is changed by re-running the first command; you should get 0
Test everything should be working