HTTP 404 · type invalid_request_error · retryable false

defaultMessage Template not found.

template_not_found

No template matched the name / language / channel you requested.

What to do

1. Verify templateName spelling (case-sensitive) and language (e.g. en_US).
2. Confirm the template is synced to the same WABA / channel as channelId.
3. List templates with GET /v1/templates using the same key and channel filter.
4. Wait for Meta approval if the template is still pending; draft/rejected templates are not sendable.
5. After creating a template in Meta, re-sync before sending.