Please make sure to click Allow when connecting the Dock to your Mac for the first time, as shown in the pop-up window below:
If you do not click Allow here, this pop-up window will not appear when you insert the Dock again. Please go to System Settings-Privacy and Security-Scroll down to find the "Allow accessories to connect" option and change it to "Ask Every Time", as shown below. Then re-insert the Dock. A pop-up window should appear, then click Allow.
If you do not click Allow here, this pop-up window will not appear when you insert the Dock again. Please go to System Settings-Privacy and Security-Scroll down to find the "Allow accessories to connect" option and change it to "Ask Every Time", as shown below. Then re-insert the Dock. A pop-up window should appear, then click Allow.