Notification Namespace Push Error "The remote name could not be resolved"
This may or may not be related to https://video2.skills-academy.com/en-us/answers/questions/1283383/missing-notification-hub as both problems have recently occurred.
The only other background information is that my April Visual Studio monthly credit of $150.00 was maxed (testing Azure Cognitive Services did that). But now it's May, and my remaining credit is $149.99.
The problem is any connection to a previously working Notification Hub Namespace service endpoint throws the error "System.Net.WebException: The remote name could not be resolved: 'xxx-yyy-zzz.servicebus.windows.net'" (the xxx-yyy-zzz is a replacement for the actual name).
This is happening on multiple Notification Hub Namespace originating from different servers in different physical locations.
What has caused this and how do I fix it?