Azure Static Web Apps custom domains stuck in "Deleting" state across multiple Static Web Apps

I am seeing the same behavior across 3 separate custom subdomains and 3 separate Azure Static Web Apps. Two custom domains failed validation. A third custom domain had already been validated and was working successfully. After attempting to remove the custom domains, all three became stuck in a permanent "Deleting" state. Azure Portal deletion, Azure PowerShell (Remove-AzStaticWebAppCustomDomain) and Azure REST API deletion all fail to remove the resources.

My environment is:

• Azure Static Web Apps
• Region: West Europe
• DNS hosted in Microsoft 365 DNS
• All resources are in the same Azure subscription

I have tested this with 3 different subdomains across 3 different Azure Static Web Apps.

• Subdomain 1: Previously validated and working correctly.
• Subdomain 2: Validation failed.
• Subdomain 3: Validation failed.

In all cases the DNS records point to the correct Static Web App hostname and resolve publicly.

After the validation failures, I attempted to remove the custom domains from all three Static Web Apps, including the one that had previously been working successfully (Hoping to link to a different static web app).

The result was:

• All three custom domains became stuck deleting.
• The Azure Portal shows them in a Deleting state.
• The delete operation never completes.

One of these resources has now been stuck in Deleting coming up on 20 hours.

I have already tried:

Azure Portal

• Adding custom domains
• Removing custom domains
• Re-validating domains

Azure CLI / REST API

Attempted deletion via:

az rest --method delete

The request completed without error, but the custom domain resource remains and still reports:

"status": "Deleting"

Azure PowerShell

Attempted deletion via:

Remove-AzStaticWebAppCustomDomain

The operation sits in progress and does not complete.

Looks like a lot of people encountering the same issue.
I can provide subscription ID, resource IDs, correlation IDs, Activity Logs, and API responses privately to a Microsoft engineer if required.