After our ESM migration and creation of multiple Service Providers, our list of external domain users is growing rapidly. This is the result of how our other SP's communicate with external vendors. By contrast, our IT department rarely communicates with external contacts from SolarWinds, so the hundreds (soon to be thousands) of new users are making it cumbersome to create new tickets for our internal employees.
As with internal users, we would like to be able to control the visibility or role of those external domain users per service provider, so that IT can hide them without affecting the other departments that need them. We would also like the ability to restrict Read access to filter out those specific users in Roles and Permissions.
Example of External Domain Users in our IT tenant users list:

Creating a new IT ticket returns all of those new external users in the Requester dropdown:
