FP3 - No WiFi hotspot, USB tethering, nor VPN connection on Android 10

[teezeh]

Sounds really like the IPv4/v6 issues that I experienced myself. After setting up my carriers Dual Stack APN, everything works fine.

I do not think that using alternative DNS servers still works, though. See

After updating to Android 10 no more alternative DNS servers - nach Update auf Android 10 keine alternativen DNS server mehr

I have the same issue with Wireguard. On my home wifi, my phone has an IPv4 address and a link-local (useless) IPv6 address (fe80:) and on 4G, my phone has an IPv6 address and no IPv4 address. If Wireguard connect to an IPv4 address, it works only on wifi. If I use an IPv6 address, Wireguard only works on 4G. I worked nicely before moving to Android 10, but it’s certainly also linked to the IP versions available from my mobile provider.

Best wishes,
Thomas