Custom domain stuck in "Deleting" state — every delete attempt is Accepted (202) then Fails; cannot delete or re-add

[rajankanwar20-netizen]

Describe the bug
Adding custom domain www.canterrastays.com to Static Web App swa-canterra-prod (resource group rg-canterra-prod) failed at 2026-08-13T02:23 UTC with "An unknown error has occurred while adding your custom domain. Please try again later." Notably, the Validate step SUCCEEDED (HTTP 200) — the Create step itself then Failed ~10 minutes later.

The domain record is now stuck. Every delete attempt — Azure CLI (az staticwebapp hostname delete), direct ARM REST DELETE on Microsoft.Web/staticSites/{site}/customDomains/{domain} (api-version 2023-12-01), and the Azure portal — is Accepted (202), runs for ~6–10 minutes, and then transitions to Failed with no substatus. The portal permanently displays the record as "Deleting."

DNS is verified correct: the CNAME for www.canterrastays.com resolves to brave-sand-01c38990f.7.azurestaticapps.net via public resolvers (checked against 8.8.8.8).

Activity log timeline (UTC, 2026-08-13):

• 02:23:50 Validate Custom Domain — Succeeded (200)
• 02:23:52 Create Custom Domain — Accepted (202)
• 02:33:55 Create Custom Domain — Failed
• 02:39:08 Delete — Accepted (202) → 02:49:16 Failed
• 03:06:41 Delete (ARM REST) — Accepted (202) → 03:16:43 Failed
• 03:10:10 Delete — Accepted (202) → 03:16:44 Failed

Correlation IDs from failed operations:

• Create Failed: 1d37b8f4-d898-4228-a2bb-4223bea8207e
• Delete Failed: 25cbedf0-0c69-43af-bd31-057c709ca26e
• Delete Failed: f459b097-a458-41aa-a7fc-69040d5b0c72
• Delete Failed: c9908161-4c09-4c03-8a75-e9b3557484cb

To Reproduce

1. az staticwebapp hostname set -n swa-canterra-prod -g rg-canterra-prod --hostname www.canterrastays.com → fails with unknown error despite successful validation
2. az staticwebapp hostname delete -n swa-canterra-prod -g rg-canterra-prod --hostname www.canterrastays.com --yes → Accepted, then Fails
3. Record remains in "Deleting" state indefinitely; no client-side path can remove it

Expected behavior
Delete should remove the custom domain record, or surface an actionable error.

Request
Backend cleanup of the corrupted custom domain record so the domain can be re-added. Subscription and resource details above; happy to provide anything further.

[tvriesde]

I am experiencing the same problem. Adding the custom hostname failed, and then I tried to do it again, but deleting doesn't work. So I can't retry.

[thomasjgalia]

I am experiencing the same problem.

[NZEnergyJoey]

Having the same issue after 15h. Would be keen if you ever resolved this.