I can't access the Phone app

I deployed WireGuard, Pi-hole, and Unbound servers on LightSail referencing the documentation.
I can access Pi-hole’s UI without any issues, and Unbound seems to be functioning properly as well (I can tell because of the caching, which makes subsequent accesses very fast).
However, when I try to open the ChatGPT app on my iPhone using WireGuard, I encounter errors when asking questions.
Similarly, when I attempt to log in to Twitter, I encounter errors as well.
The puzzling part is that Pi-hole doesn’t show any domains being blocked. Is there a way to resolve this issue?

My debug token is: https://tricorder.pi-hole.net/gnPd0Ddv/

twitter

An error occurred. Please try again later. (The operation couldn't be completed. (com.twitter.tfs.authservice error 7.))

ChatGpt

Something went wrong. You may be connected to a disallowed ISP. If you are using VPN, try disabling it. Otherwise try a different Wi-Fi network or data connection. (1)

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