Primary Image - The existing primary has been provided by a studio partner and is not editable.

Hi,

I am the director/producer of the film linked below and have several primary posters uploaded. I would like to know why I cannot change the primary image on my own accord considering I am in charge of the account? 

This is the note that comes up when I try to change the key art: The existing primary has been provided by a studio partner and is not editable.

Desired poster art: https://www.imdb.com/title/tt15691488/mediaviewer/rm347958529/?ref_=ext_shr_lnk