The ambient machine stronghold decorations seem to be experiencing an intermittent error where they sometimes cannot be activated, giving “Cannot see Target” as the error message.
If you are experiencing it, try another hook. I was eventually able to find a hook where my Ambient Machine: Techlab could be activated. If a hook is bugged, then that entire hook layout seems to be affected, no matter which layout you choose. It’s unfortunate that we are so restricted in placing a decoration that already looks intrusive and offers little in return; I would prefer it if these defaulted to “on” and were a little bit louder.
If you are experiencing this bug, please leave a comment with which hooks work and don’t work in your stronghold, and perhaps we can figure out the pattern and pass it on to the bug team!