Welcome to the ROG forum.
Try syncing your keyboard with your motherboard.
Does it show in Aura Creator then?
I made a video to help.
At the top right of Aura Creator click the gear, click the Update tab and check for updates.
Is Armoury Crate fully updated as well?
It seems there may be some issue with Aura Creator.
When you uninstalled and reinstalled Armoury crate, did you use the Armoury Crate Uninstall tool?
If not, you'll want to use it.
Select your operating system then click Show All, it's the second download.
Then reinstall Armoury Crate + Aura Creator.
Does this get your ROG Strix Scope to show in Aura Creator?