When you share a Short link to a Workspace or R&A Report or when users get an Alert email with a link to "Analyze Further", these links contain their own session IDs which almost always requires users to log in again. After logging in, they most of the time do not land on the report they clicked on, but on the normal landing page. After then clicking on the link again, they usually get to the report they wanted to see. However then soon often follows a log out of the other tabs a user is using the Adobe Analytics interface.
Links should no longer contain their own session IDs so this logged-out-have-to-login nuisance stops.