Fonts are not from Adobe Fonts / Typekit
This check shows whether fonts used in InDesign have been activated from Adobe Fonts (formerly Typekit).
The Adobe Fonts website lets you activate fonts which can used on your Mac with InDesign and other Adobe and non-Adobe apps.
Using Adobe Fonts requires subsequent users to also have access to Adobe Fonts.
This GreenLight check flags up whenever a font used in the document has come from Adobe Fonts.
Fix this problem by avoiding using fonts which display the Cloud symbol in the InDesign Font menu.