Hi @DamianL
If you open edge://sidebar-internals/ and search for "Discover", you'll find there're two extensions about Discover. You need to include these two extensions' ids in ExtensionInstallForcelist: ofefcgjbeghpigppfmkologfjadafddi and nkbndigcebkoaejohleckhekfmcecfja.
So if you want to enable Discover button, you need to set the registry keys like this:
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Regards,
Yu Zhou