Thanks for posting your question in the Microsoft Q&A forum. I hope this article helps you:
Please don't forget to close up the thread here by upvoting and accept it as an answer if it is helpful
Not able to get Microsoft Spotlight show on a lock screen. The method in https://social.technet.microsoft.com/Forums/en-US/99c2e4d5-4967-4c64-8ef2-29d54701e8ad/how-to-turn-on-microsoft-spotlight-pictures is not helping. Only getting the default lake in mountains scene.
To enable Microsoft Spotlight on Windows 10, navigate to the "Settings" menu by pressing the Windows key and clicking on the gear-shaped icon. Within the Settings window, select "Personalization" and then choose "Lock screen" from the left sidebar. Under the "Background" dropdown menu, opt for "Windows spotlight." This selection allows Windows 10 to automatically set your lock screen background with a curated selection of images from Bing. Additionally, you may have the option on your lock screen to provide feedback by indicating whether you like or dislike certain images. It's recommended to ensure that your Windows 10 operating system is up-to-date, as feature availability may be tied to specific versions. If you encounter any issues or if the feature behaves differently, refer to the latest Microsoft resources or documentation for the most accurate and updated information.