Hey there RonHad,
Thanks for reaching out to Apple Support Communities. We understand you're unable to share a playlist with your friend, and we'd be happy to provide you with the best steps.
When you navigate to Library > Playlists and tap on the playlist you want to share, then tap the ... button at the top-right corner, a pop-up window should appear from the bottom of the screen. Try swiping up on that window to uncover more options in that window. If you don't see Share, try tapping Edit Actions at the very bottom of that window. From there, try adding Share to your Favorites by tapping the green + symbol next to the word Share, and hit Done. Are you able to then share that playlist without an issue?
If not, does the Share option fail to show up for any and all playlist you attempt to share, or just certain playlists?
If you try sharing your Apple Music playlist to one of these apps (if you have any installed), does it share without issue?: How to share music to Facebook, Instagram, or Snapchat on your iPhone, iPad, iPod touch, or Android device
If you have your Apple Music Profile setup, are the friends that are following you, able to see the playlists without issue? See what friends are listening to in Apple Music on your iPhone, iPad, iPod touch, or Android device
Take care.