The best way to check that a conversion action is working/set up:
- Login to Google Tag Manager (GTM) (https://tagmanager.google.com/?authuser=1#/home) and go to your account and enable the Preview Mode
- If you refresh (or access a webpage) after you've enabled the Preview Mode, on the bottom (or on the right side) of the webpage you'll be able to see GTM data (tags which fired and which didn't)
- Complete the contact form and you'll be redirected to the Thank You (TY) page.
- On the TY page, verify if the Google Ads Conversion tracking tag fired, If it did, everything is ok.
Testing The Landing Page Used In The Ad - If you want to test the landing page URL, it’s best to Google the brand name and click on the ad. Yes, this will spend money (although the CPC for the branded campaigns is always super low), but it’s necessary because of parallel tracking. Parallel tracking is complex, but it has to do with the fact that there’s the actual URL and then there’s the version of the URL with UTM parameters added to it (if you set those up). Sometimes, the UTM “tracking template” version of the URL can work without the actual URL working...which is dangerous, because it might give you a false positive if you just click on an ad from inside the account.