WhatsApp Error 0: Authentication error

What this means#

Unable to authenticate the app user.

Why it happens#

• The access token is invalid, expired, or revoked.
• App access has been blocked in settings.

How to resolve it#

Obtain a new access token and verify the app hasn't been blocked from accessing the account.

Learn more#

See Meta's official reference for WhatsApp error code 0.

Still stuck?#

If the error persists after trying the steps above, note the exact error code (0) and reach out to support with the message details — the code tells us exactly what WhatsApp rejected.