UPDATE: The issue has been resolved, and the Remote Admin service is now fully functional.
If anyone is ever unsure whether a connectivity issue is widespread or local network, you can verify the real-time status of the service at any time.
Check the Remote Admin status indicator in the upper right corner of the subscriptions page on our support site: Subscriptions – Hubitat Support
We have identified an issue with our Remote Admin service, and our engineers are actively working to resolve problem. We will update this post when the service has been fully restored.
Thank you for your patience and understanding.