Hi, Try below Go to Settings, and tap Lock Screen, Then tap Notifications. Just find the Widgets option and set the Lock screen and Always on Display to the Music controller And once you have Spotify playing It will show on the Lock screen
The lines on the image Are where l have removed My Email and phone number Incase my phone lost
Thats the different issue to what I have, if for any reason I restart my phone, battery dying, phone update, the widget auto opens on screen when I've had the app closed for a few day. Drives me insane! Lol