@Tarun Mehta , Just to clarify, is this confined only to Azure Notification Hub resources? What subscription are you leveraging? Were there any changes prior to this issue?
- Kindly ensure you're logged into the right subscription directory (switch directory from the Azure Portal).
You may double check the subscription of the resource(s), and then navigate to the Azure portal settings page ensure if the subscription is filtered out under the Default subscription filter.
https://ms.portal.azure.com/#settings/directory
2. Ensure Notification Hub Registration Provider (RP) is registered.
--Azure Portal >> Select the subscription you want to use to register a resource provider >> under Settings selectResource providers
.
--To register a resource provider, select the resource provider and then select Register
You can see the registration status and register a resource provider namespace through the portal.
3.Just to isolate (if you haven't already so), switch to a different web browser/re-login and then check.
Kindly let us know how it goes, I'll follow-up with you further.