I already got the answer! I mixed up the targeting country in the ad campaign and the linking site of my store
😮 I was always using my campaign for USA and changing the site for the link of my store... So basically I was trying to put a French ad onto the .com site and link the click to my store on .fr site. ]:)
I simply need to create one campaign for every country/language I am targeting and then use as many ads (product types) I want into that campaign.
Great services for the support group!