What happened
Your number has messages to this group that are still sending.
How to fix it
Wait until they finish, then retry.
This error is safe to retry. Wait for the Retry-After header when it is present. If the endpoint takes an Idempotency-Key, reuse the same key so a retry never creates a duplicate.
Example response
An illustrative example. The message wording and the contents of details vary; branch on error.code.
Still stuck?
Email support@blujay.io with the trace_id from the error response. See Errors for the response format. 
