This posting is older than 6 months and can contain outdated information.
Thanks for asking.
By default, the Logitech software has no commands set for these buttons.
To use these buttons with Remote Buddy, you need to assign particular commands to the buttons in the Harmony configuration software.
For a step-by-step guide and an overview of buttons that have no commands assigned by the Logitech software by default, please see the HowTo (Step 3: Optimizing the Harmony configuration > Unlocking all buttons of the Smart Control):
https://www.iospirit.com/blog/article/184/-/
Cheers,
Felix