For me, it used to work until 2 weeks ago (as long as I had the slide-over version of Spotify enabled) on my iPad. Now it doesn’t work, even when I turn the in-game sound of roblox off. Spotify used to override Roblox sound, but now Roblox takes back control of the sound for it just to play, you guessed it: absolutely nothing!
I contacted Roblox support about this issue as well & they said “wE’lL lOOk iNtO iT 🤓” with an automated bot reply. Haven’t heard from them since. This is frustrating because I don’t like playing Roblox with my sound off entirely. Other games such as Minecraft will work with Spotify just fine (it overrides the in-game audio like it’s supposed to). Don’t really know why Roblox is intentionally making it impossible to play Spotify while in-game. Back in 2021, they stopped letting Spotify be played from control center too, but playing it in slide-over like previously mentioned still worked. It doesn’t hurt them for me to play my own music on my own device, does it?