Static Web Apps deployments never complete - all environments

Question

Since ~14:58 UTC 2026-07-21, no deployment to our Static Web Apps completes. Uploads succeed; the deployment never finishes and the site keeps serving the previous build.

SWA CLI 2.0.10 output:

"Finished Upload. Polling on deployment." -> Status InProgress ~190s -> "Failed to check deployment status, retrying..." -> "An unknown exception has occurred" (exit 1).

GitHub Action (static-web-apps-deploy@v1): "We are currently experiencing problems communicating with our content server."

Deploying to a NEW preview environment fails instantly, before upload.

Azure's own record shows the Production build "status": "Failed".

The "Diagnose and solve problems" blade for the resource also fails to load.

<Edited PII>

Ruled out: token is valid (accepted, DeploymentId issued); app is 11.8 MB vs 500 MB limit; reproduces outside GitHub Actions; two independent apps affected; same artifact deployed fine at 12:35 UTC the same day; no Service Health event; the Container Apps API in the same workflow deploys fine every time.

Why are deployments accepted but never completed, and how do we clear the failed Production environment?