I am running Steam on both Windows 10 and macOS Catalina.

I am unable to Family Share on macOS, but have no problems what-so-ever with Family Sharing on the Windows 10.

When attempting to set-up Family Sharing on macOS, I "Authorise Library Sharing on this Computer", however none of the accounts who have previously logged into Steam using their accounts on this computer appear in the list of "Eligible Accounts" (the list is empty). It is worth noting that when they log in they can see my account in their list of "Eligible Accounts". It might be relevant to note that I have Admin access to this Mac, whereas they don't.

So I set-up the Family Sharing (using the same Steam accounts) on the Windows 10, and that all works fine.

On Steam on macOS, I can now see their accounts in the list of "Eligible Accounts", however when they use Steam on macOS they still cannot see or access any content in my library.

Can anyone advise how to get Family Sharing working on macOS?

Thanks.