Applies to Rednet PCIe & PCIeR card
Starting in macOS 10.13 'High Sierra', Apple have introduced a system that will automatically prevent users from running driver software unless the user manually allows each driver individually from System Preferences. Once the user has allowed the driver manually all other driver software by that developer will be allowed through automatically without having to repeat the steps.
If you are finding the PCIe / PCIeR card appears correctly in Dante Controller and in Rednet Control but not in System Preferences > Sound > Output or your D.A.W's audio preferences, it is likely you are encountering this issue.
How to fix it
To fix the problem, as the error message suggests, you need to go to Apple Logo > System Preferences > click 'Security and Privacy'. In there, click the 'Allow' button in the lower right corner:
After clicking the "Allow" button you'll be presented with a list of software/drivers that have been blocked. Tick the checkbox next to anything with 'Focusrite' or 'Audinate' in the name, then click OK and select the option to restart the computer.
NOTE: newly installed software/drivers will only appear in the list for the first 30 minutes after the driver/software in question has been installed. If the Allow button isn't showing for you or the driver you wish to load isn't showing up on the following screen, simply reinstall your Focusrite software again and restart the computer (it's not necessary to uninstall anything before trying this). Once your computer has restarted go to System Preferences > Security and Privacy immediately after your computer has booted up and the option to "Allow" the driver/software to load should reappear.
If you encounter any problems please contact Technical Support