Internet sharing not working. "kWiFiLocNoInternetTitle..."

Trying to share internet from ethernet connection via wifi.

It does create a network that my phone can connect to, but theres no connection to the internet.

It also shows the error message "kWiFiLocNoInternetTitle..."

Any known fixes?

(MacBook Pro 9,2. & running Sequoia 15.7.2. with OCLP)