What I want: Publish a facebook Ad with a CTA with a custom link to one of my pages of my homepage. So, if my homepage is mydomain.com; I want the CTA button of my facebook ad to link to for example mydomain.com/mypages/registernow?utm_source=facebook&campaign_id=12.

What I tried: Simply to create a new campaign in the facebook ads manager, specified the URL mentioned above, and saved. It all worked, but once the campaign got published, the CTA button links to mydomain.com.

I know this is not a question that has anything to do with coding, but thought of asking it here still, as there are may some developers having experience with this issue / how the provided facebook ad URLs are parsed and eventually disabled / automatically replaced with the root URL.. ?