Troubleshooting guide
How to fix the problem
Settings > Network & Internet > Wi-Fi/Ethernet > DNS Server Assignment. If you don't know, leave automatic DNS or use only a trusted provider.
If the problem persists
Make a note of the current DNS addresses to revert the change. Do not change the DNS of the work network without permission - the internal system may no longer work; if the error persists, check the VPN as well.
Request a repair