In One of our Assets Schemas we have an End user object type that houses a Jira ID.
That object resolves for a select few users and not others.
When I mouse over the "Unknown User" tile it gives the "Oops we're having issues. Try again"

I have Org Admin/Site Admin permissions and can't access this Attribute
Another User with the same issue was added to the Schema Managers Role and has this problem. Here is the schema settings

In addition if I try to add a user the lookup doesn't resolve with any options
When I visit the admin console and look at our users there isn't a difference between the users, excluding myself, that can and cannot see this attribute
Any troubleshooting suggestions are appreciated.