I deleted and reinstalled both Instagram and Spotify. I already see the option tonshare in stories but when I tapped on this option, nothing happened, Instagram hasn't been opened and no error message popped up.
Well, I've already changed my mobile, now I have a Samsung Galaxy M30, and I can't share music on Stories um Instagram yet. I remember I had the same problem with Google Music, and this was one reason to use Spotify instead of those other music service. Maybe I should give up Spotify too. Whatta shame!