Why is my Meta Pixel showing a “De-duplication error” for standard events?

A Meta Pixel de-duplication error is triggered when your server and browser event names, event IDs, or external ID variables are missing or misaligned, preventing Facebook’s backend from identifying matching event pairs.

“Most minor website breaks are caused by simple script conflicts, legacy code blocks, or broken API handshakes. We identify and clear these issues immediately as a straightforward, one-time fix.”
— Jeff Bollettino, Managing Director, Ignite Conversions