Please see this thread.
The solution is on this reply.
I strongly suggest that the option to force remove internet be disabled by default, and that a warning is issued on the project validation if internet access is not set to required, web requests won’t work at all. The error message isn’t helpful, and the solution is obscure. I wasted hours on this, the current combination of project settings + XR settings prevents web requests from working by default on Oculus.