Hi,
Do you mean the pictures aren’t changing, or that you’re unable to select Windows Spotlight? If the pictures aren’t changing, try re-registering Windows Spotlight using this method and see if it helps. After the reset, it can take up to 48 hours for the images to sync, so you’ll need to give it some time before checking if the rotation works again. Please use your browser translation option to translate this page to your native language.
Windows Spotlight is known to break easily, and this has been a recurring issue with the feature. If the method above doesn’t work, I suggest trying this app instead, which offers similar features to Windows Spotlight.