E12000 — SMSBackendUnavailable
The SMS service is temporarily unavailable. Please retry.
- HTTP status: 503
- Type: service_unavailable_error
- Name: SMSBackendUnavailable
What to do
This is a transient error and needs no change to your request. Wait a few seconds and send again; if it persists, retry with exponential backoff.
Related
- E12xxx — SMS sending & delivery: every code in this range
- Errors: the full wire contract, status mapping, and error catalog
- Error handling: branching on type and code, validation details, and vendor_code
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