The Xiaomi Home Assistant has been a popular choice for smart home enthusiasts, offering a range of features and integrations to make life easier. However, some users have reported an issue with the Yeelink light ceiling series, where the atmosphere lamp entity is missing in the Xiaomi Home Assistant. This article aims to provide a comprehensive overview of the issue, its causes, and potential solutions. The Yeelink light ceiling series, including models yeelink.light.ceiling10, yeelink.light.ceiling20, and yeelink.light.ceiling19, have been found to have the atmosphere lamp entity in the Mi Home app but not in the Xiaomi Home Assistant. To resolve this issue, it is essential to understand the differences between the Mi Home app and the Xiaomi Home Assistant, as well as the potential causes of the missing entity. The Mi Home app is designed to work seamlessly with Xiaomi devices, providing a user-friendly interface to control and monitor smart home devices. On the other hand, the Xiaomi Home Assistant is a more comprehensive platform that integrates various smart home devices, including those from other manufacturers. The missing atmosphere lamp entity in the Xiaomi Home Assistant could be due to a compatibility issue or a bug in the software. To fix this issue, users can try updating the Xiaomi Home Assistant to the latest version, which may resolve any compatibility problems. Additionally, resetting the Yeelink light ceiling device and re-pairing it with the Xiaomi Home Assistant may also resolve the issue. In some cases, the problem may be related to the device's firmware, and updating the firmware to the latest version may be necessary. The Xiaomi Home Assistant is a powerful tool for smart home enthusiasts, offering a wide range of features and integrations. While the missing atmosphere lamp entity issue may be frustrating, it can be resolved with the right troubleshooting steps and software updates. By understanding the causes of the issue and taking the necessary steps to resolve it, users can enjoy a seamless smart home experience with their Xiaomi devices.