How do I share an Apple Music playlist with friends

This link may help Create and share playlists - Apple Support

Check that your not trying to share a Smart Playlist, they can’t for some reason.

Also this may help https://www.imore.com/apple-music-playlist-sharing-is-completely-broken

Open iTunes, when your playlists get listed on the left hand side, try a right click on any one of your playlists, you should see these option to share.