There does appear to be an issue, Sonos has not yet updated status.Sonos.com, but there are already many threads. 

And, Sonos updated as I was replying. 

Hi @Angel244, welcome to the Sonos Community!

As Bruce suggested, there was a service outage with Spotify. An update was posted on the status page but this has since been resolved.

If you’re still unable to use or see Spotify in the Sonos app then please do the following in this order:

1. Reboot your Router.
2. Reboot your Sonos speakers.
3. Reboot your controller.
4. Remove and re-add Spotify in Music Services.

If you’ve followed these steps and you’re still having issues, then please reach out to our support team for further assistance.

I hope this helps!