azureedge.net domain and related Azure services are expected to stop working very soon as Azure's provider, Edgio, has gone bankrupt.

It's more than .net team using that domain, customers do too.

https://devblogs.microsoft.com/dotnet/critical-dotnet-install-links-are-changing/

Critical: .NET Install links are changing - .NET Blog

The .NET installers and archives distribution method is currently changing unexpectedly. This change may impact your development, CI, and production infrastructure. It is crucial to validate if you are affected and monitor for any downtime or disruptions.

.NET Blog
Azure Front Door impact re Edgio bankruptcy, action required. https://learn.microsoft.com/en-gb/azure/frontdoor/migrate-cdn-to-front-door
Migrate Azure CDN from Edgio to Azure Front Door - Azure Content Delivery Network

Learn how to migrate your workloads from Azure CDN from Edgio to Azure Front Door using Azure Traffic Manager.

Edgio actually filed for bankruptcy many months ago but apparently everybody pretended it wasn't happening, then when it informed customers it was definitely going under a month ago, everybody was on holiday.

See also DigiCert dropping IPv6 support etc.

Some answers to questions in the thread:

Q) didn’t Akamai buy Edgio?

A) no, they just purchased customer contacts (spoiler: sales calls are coming). Link: https://www.akamai.com/newsroom/press-release/akamai-announces-winning-bid-for-select-assets-of-edgio

Q) How do you know Digicert use Edgio?

A) nslookup something like Digicerts CRLs.

Another hilarious one is look at all the things currently hanging on Edgio - from things like open source projects with one guy in Nebraska to cloud services, this may turn out to be a bumper quarter for Downdetector.
@GossiTheDog Arsenal FC website is still running on Edgio