I know it sounds simple, but it's often overlooked. Could you try restarting your device? Sorry if this may sound a bit repetitive but if that doesn't help, try a quick clean reinstall of the app by following these steps.
Could you also try using the Remove Offline Devices and Sign Out Everywhere from your Spotify account page to see if that helps?
If you're still having trouble, could you let me know the exact version of Spotify and the exact version of the operating system you're running?
I'll see what I can suggest next!
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