I did everything you included in your first paragraph.
I could try again but I don’t know if this makes any difference, at least I read a simmilar story on reddit some time ago. If I remember correctly it was about a person who got banned on Instagram and therefore he was not able to get his data deleted.
This was the sender email: notification@email.meta.com
And all links point to meta.com, so no phishing
You just need to connect the raspberry to your network, set a static IP and set the DNS server in your router to the IP of the RPi. Your router handles all the Routing and Wifi and the RPi just resolves DNS queries.
I suggest looking up what DNS is and that should clear things up for you.
Btw, I gess you meant wlan with wan, those are two different things in networking.
You can look into Plasma Bigscreen