E12018 — SMSAlphaNotSupported
Alphanumeric senders are not available for the destination country.
- HTTP status: 422
- Type: validation_error
- Name: SMSAlphaNotSupported
The public API does not return this code. It comes from Bird's other surfaces, such as the dashboard, the CLI, and the MCP tools, which link here when the error occurs.
What to do
Use a different sender type for this destination country; alphanumeric senders are not available there.
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