How should Cloudflare connect? That error message is pretty clear and in the apparent Teamspeak context even clearer. You cannot use Teamspeak over Cloudflare’s proxies.
I know friends who use and work normal
I am sorry, but that doesnt make more sense either. What exactly is not working?
And if you are saying your friends use Teamspeak over Cloudflare, I am afraid that cant be correct as Teamspeak does not use HTTP and consequently does not proxy over Cloudflare unless your friends have Enterprise accounts and use Spectrum.