I am trying to share content for DH through my Roll20 subscription. I have linked the accounts, enabled content sharing in Roll20 but my players still have limited options for character creation when they attempt to create through Roll20.
Sorry that you’re having trouble with content sharing! Since the actual content itself is coming from Demiplane you’ll need to share the content through Demiplane rather than Roll20. Then, when they go to create their character within the integrated character sheet on Roll20 they should have access to everything.
You can find more information about how to share content in Demiplane here.