You may have seen the following message after launching Ecamm Live on macOS Sequoia:
This permission is required for Ecamm Live’s Stream Deck plugin to communicate with Ecamm Live.
If you’ve seen this prompt and have already chosen “Don’t Allow”, you can grant this permission by enabling the toggle next to Ecamm Live in the Privacy & Security control panel of your Mac’s System Settings application. You can find this under “Local Network” once you have selected Privacy & Security from the left.