I remember having some issue like that, but I’m not sure if this was the fix.

Try unchecking “Show desktop notifications when the song changes” on Spotify’s settings (right now it’s under the Display section).

May be a coincidence, but it stopped launching for me too. Worked Monday and Tuesday, yesterday I didn’t try to play, today it didn’t work.

Tried:

• running “verify integrity of game files”
• forcing Proton,
• clearing shader cache
• attempted various launch options, like vulkan, fullscreen, and windowed
• update all flatpaks (since I installed steam through flatpak)
• reboot