60-70% coverage

Our internal tracking shows that only about 60-70% of conversions coming from Google Ads are being registrered by Google Ads.
For context we are using Google Ads conversion tracking via Stape serverside Tag Manager. Our website is a Sveltekit app.

We are seeing this error in Sentry a lot and are wondering if it can be related to missing conversions:

ReferenceError: Can’t find variable: gmo

It only happens to iOS user that are using Google as the browser. Have anyone faced a similar error?

What is the expected coverage?

What do you compare the results to? In other words, what is your source of truth about the number of conversions in Google ADS?

If it’s just an internal system that checks utm parameters - it’s not a valid comparison. Attribution in Google ADS works much more complex than just tracking utm + you need to take into account the attribution settings that are specified in your campaigns and conversions themselves.

We are seeing this error in Sentry a lot and are wondering if it can be related to missing conversions:

Maybe you have some problems with data layer in some cases and because of that tags don’t work sometimes.