101001 — Invalid recipient number
Error code `101001`: Invalid recipient number.
101001 is a non-success business code. A 2xx HTTP response can still contain it.
What it means
Invalid recipient number
Why it happens
The downstream confirms the number does not exist, is inactive, or cannot receive SMS.
What to do
Check and update the number.
Retry guidance
Do not automatically resend. A new send is a new business operation and may create another charge or duplicate message.
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