Resource Provider GitHub.Network stuck at Registering state

Question

I tried to configure private networking for GitHub-hosted runners according to https://docs.github.com/en/organizations/managing-organization-settings/configuring-private-networking-for-github-hosted-runners-in-your-organization

There's a step to register resource provider "GitHub.Network"

az provider register --namespace GitHub.Network

However, the provider is stuck at Registering state for a long time

az provider show -n GitHub.Network -o table

Namespace       RegistrationPolicy    RegistrationState

GitHub.Network  RegistrationRequired  Registering