I can't do Ad Setup with existing post on Facebook Business. Weid video links ending with ""

Hi, I have a big issue with my FB manager.

When I create and advertising, when I click on "see post / Facebook Post with comments", all my videos are ending for example like this (I have put fake numbers) :
facebook.com/111111111111111111111111/Posts/11111111111111?dco_ad_id=11111111

The end of the link is weid, there shouldn't be any"?dco_ad_id=" extra
A proper link is supposed to end like this : facebook.com/111111111111111111111111/Posts/11111111111111
Also, it's written " NameoftheFBpage " when let the mouse on tab.

Because of that, I can't Ad Setup with existing post. All I get is the error message :
"This post can't be used for an ad because it doesn't exist on the Page you've chosen, or it was originally created on a personal profile. Please choose a different post and try again."

I am on the FB manager of my company, so I don't understand what I did wrong. If someone had the same issue could you please help ? I've spend 6 hours on this, trying to do everything from zero etc... nothing worked

submitted by /u/Morpherusse
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