Explore Tab Security when assigning a Journey

Summary:

Some HR Administrators cannot access all employee list when assigning a Journey via the 'Explore' tab. However if they navigate to Allocate Checklist they can access the full employee population

Content (required):

Assignment via Journeys - only access to self

Assignment via Allocate Checkist is no problem.

I have a security problem somewhere but am struggling to find the source. Can someone direct me to the permissions?

Version (include the version you are using, if applicable):

22C (but this was an issue for us on 22B as well)

Code Snippet (add any code snippets that support your topic, if applicable):