If you go to https://tools.developer.homey.app/tools/ble and click on Discover Devices, you should see a list of all the BLE devices that your Homey finds. Look for the MAC address of your SwitchBot device and click on it. The right side panel should then show the details of the device and in there should be the Advertised service Data field. If that is consistently showing as [ ], then try sending a system Diagnostics report to Athom to see if they have any idea why it’s not finding the data.
Normally, that is a range issue, but you say the device is next to Homey, so that shouldn’t be the case. As part of the information shown for the device is the RSSI (signal strength) and if that is below -60 (0 = best and more negative is getting worse), it could indicate a hardware issue.
