Putting a Google ad conversion tag on a WooCommerce order confirmation page

Has anyone put a Google ad conversion tag on a WooCommerce order confirmation page?

We have our website on Wordpress, use WooCommerce for our ordering and use a Divi Theme.

I tried doing this with one webmaster and we weren't able to get it to work. We tried putting the tag on the order confirmation page and couldn't get it to work.

Now, I have a new webmaster. I set up the conversion tag in Google ads and emailed it to her. She said she used a plug in to set it up on the page. She said she viewed the page, but I'm still seeing it labeled as inactive in Google ads.

Don't know why we're having such problems? What's the trick?

I'm not very familiar with Wordpress. Seems like this should be worked out or other people should also be having this problem.

PHP was suggested as a tag for this question, so I thought I would add it.

Thanks,