this post was submitted on 17 Oct 2023
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This sounds like the Wireguard client can't find a DNS server. Telegram and the other working apps either have the necessary IP addresses cached or built-in. Anything that needs DNS fails.
Does your DNS server accept request from the Wireguard network? Or do you have NAT correct on your Wireguard server?
Insert meme :ItsAlwaysDNS:
This. I had to manually set my DNS server in the configuration for the wireguard client for it to work. A test I like doing is browsing to my router's configuration address to test that IP traffic is working.