It seems there is not way of showing non-administrators a list of users with their related attendance status. There is a workaround with using chat (tanks, Marek!), but this is not a good one. BTW: Permissions are allready se to "aee all active users".
So, here my user story:
As a eRM user I would like to see a a list of other active users (if allowed by my permissions) with their attendance status to have an overview of my colleagues' attendance status and a good starting point point to show their user profile (reports, taks, hitory etc.).