Let's say Internal User (IU) shares a report with an External User (EU1).
EU1 may want to share it with his colleagues EU2 and EU3.
IU wants to allow EU1 to freely share the report with EU2 and EU3 and any other EU4 or EU5 that EU1 deems appropriate.
The idea is to have a configuration option for internal users to allow other external users to self-register for Workbench (with IdAM/GUM) and self-nominate for access to view a certain shared report.
We may want to add certain restrictions such as only allowing users with confirmed email addresses from a certain specific domain suffix to access the report.