Documenting the process for having Logitech G Hub recognize your devices since there wasn't much information available online.
Note: in this case, I was trying to connect a Logitech G600 mouse to reprogram the programmable side buttons.
What worked for me:
-
Unplug the Logitech peripherals from your computer
-
Uninstall Logitech G Hub if has been installed before
-
Open System Preferences
-
Go to Security and Privacy
-
Press unlock to make changes
-
Install (or re-install) Logitech G Hub
-
Plug in your Logitech peripherals
-
(Optional) A reboot may be needed before connection is successful.
Solution found in this reddit comment.