I tested this some time ago and got similar DNS update errors.
I think, the DNS update error is because of selecting dns-backend=NONE when joining.
dnsmasq is used which is not a supported DNS backend, so the error should be ok.
I tested this some time ago and got similar DNS update errors.
I think, the DNS update error is because of selecting dns-backend=NONE when joining.
dnsmasq is used which is not a supported DNS backend, so the error should be ok.