The links certainly do work, it means you have not linked your github account to your UE4 account. (This is evident by the fact you cannot see my repo, which is a fork of the official UE4 repo, so if you had access to the UE4 one, you would be able to see mine). If you can reach the main UE4 github page, you can access the above two links. So I would make sure you have mapped your account correctly. Step #2 in the link provided.