Consider changing the DNS servers your computer is using to resolve domain names. The fact that your phone can connect when not connected to your wifi implies the issue is likely related to either your ISP or network settings.

Do a duckduckgo search on how to manually change your DNS server setting in Windows or OSX, which ever you use. Then pick a DNS server IP from the list here https://docs.pi-hole.net/guides/dns/upstream-dns-providers/ and use that IP in-place of what ever IP the guide your DDG search told you to use.

Ideally you'd modify your router to use that IP and have it push it out to all connected devices on your network instead of manually changing it on each device.