My 6T (unrooted) Android 10.3.5, won't tether - not by USB, not by Wifi nor by Bluetooth.
Not a carrier issue - I can tether with my wife's phone.
Weird behaviour - occasionally the tethered device (PC) will have internet, but not the phone, sometimes the phone will have internet and not the tethered device.
I have AdGuard and NordVPN installed, but I turn them both off before trying to tether.
I have disabled Private DNS before trying to tether.
Doesn't work in Safe mode either. Shows connected device to hotspot on phone.
If I connect the phone to Wifi then the PC has internet and the phone does also - not very helpful.
It used to tether months ago.
Any ideas please?