Solution: Re-check Step 6 and – if necessary – redo Step 7 from the Create a project steps.
Solution 1: Check if permissions are properly set. Step 8 from the Create a project Folder Mode example or Step 11 from the Domain Mode example.
Solution 2: The node needs to have all user roles activates. When changing user roles republish the node in "Content Wartung"
Solution: If you are not redirected to the correct URL, re-check how to properly configure the authentication for domain mode.