How to find my thank you page?

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Hey there, 

I'm having huuuge troubles finding out what the correct thank-you page of a web form is so I can add tracking in GA and FB Ads Manager. 

I want to track the successful submissions of this form: I got transferred to this thank-you page: I tried adding the tracking with "contains", "begins" and "regular expression" but nothing works. I asked the team and they told me that the same thank-you page is visible to them as well. When I try to set it up via FB Pixel (directly from the page), I see that there was some other page / redirect. I see that also when I tried to troubleshoot it with Google Tag Assistant. 

Please help : )