Try booting something different on proxmox like an ubuntu live desktop, just to make sure networking is working there. Seems like haos can’t talk to the Internet.

If a controller is still connected (Bluetooth?) it may be a controller order issue, you can try reordering them.

No, the browser would still send YouTube.com as the host header. While yewtu.be could be configured to allow this to work, the TLS cert would not and the browser would get upset.