E12004 — SMSTLSVersionNotSupported
TLS 1.3 is required to send to this destination.
- HTTP status: 422
- Type: validation_error
- Name: SMSTLSVersionNotSupported
What to do
This destination country requires TLS 1.3 for delivery. No change to your message resolves it; if it persists, contact support.
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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