Hello,
Are both the blue and orange LEDs lit on your Multilink ACP? How are you providing power, the Multilink ACP cannot provide power to the target device so the target device must be powered externally. Are you trying to connect via SWD protocol? If so, it looks like you have the “Use SWD protocol” checkbox unchecked which may be your issue.
Some things to consider, let me know if any of this information is helpful.
Steve