Google Ads conversion tracking error 400

Job ID: 35565679

Budget: €12 – €18 EUR

We are using Google Tag Manager to integrate Google Ads in our website. We have defined Conversions on our Google Ads account. And we have defined those Conversions in GTM. However, when firing the event, the URL call responds a 400 error. The event is fired but the Google Ad server responds with an error.