Meta WhatsApp Error Code 100 (WABA Invalid Parameter) — Unsupported or Wrongly Formatted Parameter — Fix

Overview

Error code #100 — "Invalid Parameter". The request contains an unsupported or incorrectly formatted parameter. This is a request-formatting issue, not a ChatDaddy bug.

Why This Happens

Common causes include:

• A misspelled parameter name.
• Wrong RSA key format.
• A phone_number_id mismatch.
• A field that exceeds its character limit.
• A duplicate template name.

What to Do

1. Read the error detail — it usually names the offending field.
2. Correct the parameter name or format per Meta's API documentation.
3. Re-submit the request once the field is fixed.

Suggested Reply

The error you're seeing is Meta error code 100 — "Invalid Parameter". Something in the request is misspelled, wrongly formatted, or exceeds a limit (for example a duplicate template name or a phone number ID mismatch). 🙂

What to do:

1. Check the error detail — it usually points to the exact field
2. Correct that parameter's name or format
3. Try again

If you share the full error message, I can help pinpoint the field. 😊