Count number of Projects an Assignee have

You can count Projects where an assignee have assigned issues.

NonZero(Count(
  Filter(
    [Project].[Project].Members,
    [Measures].[Issues created] > 0
  )
))

However, the calculation does not take into account user role in a project. eazyBI does not import project roles and related users by default.

Daina / support@eazybi.com