When I share music from Spotify to Instagram, the "play on spotify" link is no longer appearing in the top left hand corner. Only the album artwork is posted with no link. This feature worked for me previously but is no longer working.
I have tried deleting and reinstalling both Spotify and Instagram apps and the issue persists.
I think there is a bug for this at the moment as its not working for me either but i know instagram and spotify are working hard to get this sorted.. maybe try contacting spotify Here and let them know the issue your having and maybe they already have a solution to fix this.