Having EUCON enabled will create conflicts with HUI devices (UF8, UF1, Sigma, Nucleus, AWS, Matrix, and Duality).
EUCON is only enabled if a EUCON compatible controller is connected. In Pro Tools 2024.6.0 onwards, you can see if EUCON status in the Edit Window transport bar. If you want metering and plug-in control to work on your UF8 and UF1, please disconnect any EUCON controllers and make sure the status light is not illuminated.
For some users this is not too much of a problem, if they want to use an Avid EUCON app (e.g. the Avid Control App) or a EUCON control surface alongside UF8. Everything else on UF8 should work just fine.
This issue appears limited to Pro Tools. Customers have reported the UF8 to be fully functional via MCU control in Cubase/Nuendo when working alongside a EUCON controller.