They blocked third-party slicers for printers with a firmware update. I personally use OrcaSlicer (a fork of Bambu Studio with additional features, and Bambu Studio is itself a fork of PrusaSlicer…), so I had to set mine to LAN only mode to continue using it. That also means I can’t use their mobile app (it doesn’t work with LAN only mode, almost certainly to push people into their ecosystem of software) but I wasn’t really using it anyways.

I don’t like that Bambu are locking down on their ecosystem like this. Hopefully they don’t get any ideas from the 2D printer industry and make it required that you use their own brand of filament…