SignalLikely causeRecoveryThe repository exists but the selected package, endpoint, or product cannot be confirmedA distribution, sample, legacy name, public README, local candidate, and account entitlement are being treated as interchangeable authority.
Keep binding selection-required; capture the exact source and account evidence, then obtain an owning product decision instead of borrowing adjacent syntax.
Authentication or entitlement is rejectedThe application identity, credential generation, restriction, host, region, package, product, or entitlement does not match the selected source line.
Retain only safe request/configuration identity, reconcile the developer application and source manifest, rotate anything exposed, and retry only after the mismatch is explicit.
The first interaction times out, returns empty, or becomes unavailableNetwork, provider, region, quota, lifecycle readiness, or input constraints are unresolved.
Return a typed unavailable/empty result, preserve the same request identity for a safe read retry, and never manufacture a fixture success as provider evidence.
A callback, result, or event arrives after cancellation or replacementScreen, request, controller, subscription, or aggregate generation ownership is missing.
Reject the stale generation, dispose it once, retain current application state, and count the late result without persisting opaque content.