Yesterday, Apple released a new software update for the HomePod line of devices, which now include the first generation HomePod, second-generation HomePod, and the HomePod mini. This update addresses an issue with Siri which could have some issues when asking it HomeKit related questions, as sometimes these requests could fail.
“This update addresses an issue where asking Siri for smart home requests may fail, and also includes general performance and stability improvements.”
The new updates are out now for the HomePod mini and the HomePod first and second-generation. You can update by going to Home > Three dots (top right) > Home Settings > Software Update. However, most setups are set to automatic updates and should happen in the next few days.