​Meta's Conversions API was supposed to solve signal loss. For many teams, it created new problems instead.

​When CAPI breaks, it breaks quietly. Conversions drop. Optimisation slows down. And nobody can tell whether the issue is in Meta, GTM, or the server. The setup looks fine but the data isn't.

​In this session, Barbara Galiza and Timo Dechau will walk through the most common CAPI failure points in real-world setups and show you how to identify and fix them.

​What to expect

​We will cover:

• ​How Meta CAPI works: from browser event to server to Meta

• ​The most common sources of signal loss and why they're easy to miss

• ​Deduplication errors caused by missing or inconsistent event IDs

• ​User parameter problems such as missing or unhashed data

• ​Payload validation issues and timing errors that reduce signal quality

• ​How to use Meta's diagnostic tools to validate your own setup

​This is a practical troubleshooting session. Not every team will have all of these issues but most have at least one they haven't caught yet.

​Who should attend

​This session is for marketers, technical marketers, and data leads working with Meta Ads and conversion tracking.

​It will be especially useful if you manage or audit event data, work with server-side tracking, or are responsible for a CAPI setup nobody has fully checked since it was first deployed.

​No coding required. Bring your questions, we will keep time for live Q&A.

​About Barbara and Timo

​Barbara writes the 021 Newsletter on marketing measurement and analytics. She has spent nearly 10 years consulting for brands on data-driven marketing, working with companies like Microsoft, Mollie, and VEED.io.

​Timo is a measurement consultant focused on helping data and marketing teams build reliable tracking systems. He has worked with companies like Amplitude, Shimano, Cricut, and Audible.