Hello! I see you're encountering Error 10 with data not transferring on your Hume Health device. To help you better, could you tell me a bit more about when exactly this error appears? For example, is it when you try connecting the device to your Mac, during syncing with the app, or at another point? Also, have you recently updated the app or device firmware?

Meanwhile, here are some common steps that often help resolve Error 10 related to data transfer problems with Hume Health devices on macOS 10.15.7:

1. Power Cycle the Device
Turn off your Hume Health device completely, wait about 10 seconds, and then turn it back on. This can clear temporary glitches that interfere with data transfers.

2. Restart Your Mac
A quick restart of your computer can often remove system issues that block connections.

3. Ensure Your App Is Up to Date
Open the Hume Health app on your Mac and check it's the latest version. Sometimes an outdated app has bugs that affect syncing.

4. Check USB/Bluetooth Connection (Depending on your device)
- If your device connects via USB, try unplugging and plugging the cable into a different USB port. Using the original cable is also best.
- If via Bluetooth, ensure Bluetooth is enabled on your Mac from the menu bar, and that the device is paired properly in System Preferences > Bluetooth.

5. Manually Sync Data in the App
Open the app and look for a "Sync" or "Transfer" option. Initiate the data transfer manually.

6. Reinstall the App
If issues persist, uninstall the Hume Health app from your Mac, then download and reinstall it from the official site or App Store.

Could you please try these steps and let me know which you have already attempted? If the problem continues, we can dig deeper into the error specifics or explore account-related issues.

Looking forward to your update to help you resolve this! Are you okay with trying these first?