My share link doesn't work while in a pdf

So i made this Xd project as a part of a school project, wich was due in PDF file. So for convenience i used the " share " feature and copy pasted the link in my PDF (also tried to make it an hyperlink).
 
The issue is : when in the PDF, the link is not working, and the preview site says that " i can't access this file" and i need the owner to invite me in it ... ironically enough, i'm logged in. 
Same thing when i try to open it in a private browser tab, it'll required me to signup in order to see it ... 

The catch is that when i click on the link while in Xd or when i share it to colleagues and copy paste it in my browser it opens ( and i don't need to be logged in ) ... 

So anyone knows what's going on ? and how can i fix it ?