Activated Adobe fonts do not show in Silhouette Studio

I would most strongly suggest that you contact Sihouette's Technical Support.

Fonts that are activated via the Adobe Fonts Service are discoverable by any application that uses standard Windows font enumeration services which will make such fonts available to such applications. That is how the vast majority of Windows applications discover and use fonts. If an application is counting on font files physically being in the C:\Windows\Fonts or the C:\Users\username\AppData\Local\Microsoft\Windows\Fonts directory, it will definitely will not have access to fonts activated via the Adobe Fonts Service. Note that the actual font files associated with fonts served via the Aodbe Fonts Service are not directly accessible to applications or users.

One other possibility is that this particular application only allows use of TrueType or OpenType TTF fonts. The vast majority of the fonts provided by the Adobe Fonts Service are in OpenType CFF format. This application may be intentionally (or perhaps unintentionally) filtering out any OpenType CFF fonts.