No more “I can't open this” replies from the green side of the group chat.
The Apple Music problem in mixed group chats
Apple Music links behave beautifully between iPhones with Apple Music and fall apart everywhere else. Android friends get a browser page asking them to sign up. Spotify users on iPhone get bounced into an app they don't subscribe to. Either way, the song you wanted to share becomes homework.
The cause is simple: Apple Music links carry Apple's catalog reference, which Spotify can't interpret. The fix is just as simple: convert the link once and let each person's phone route to their own app.
Convert the link once. Each person's phone does the rest.
Albums and playlists too
Albums convert reliably because catalog metadata matches across services. Playlist sharing supports Apple Music, Spotify, SoundCloud, YouTube Music and Tidal. Playlist import supports SoundCloud, YouTube Music, Tidal and Apple Music.
The catalog caveat applies in this direction too: if a song is an Apple Music exclusive or region-locked, Spotify simply doesn't have it, and no converter can invent it there. Major releases almost always match.
The other direction works the same way
Your Spotify friends can send songs back with the Spotify to Apple Music converter. Everyone keeps the app they pay for, and the group chat keeps sharing music.