License Summary Page - 'In use' and 'Available' explained

The screenshot shows an example where the License allows 10 professional passes, of which 60% is unallocated.

This means 6 of the 10 passes are available for allocation

Yet, it also states that 4 are 'available' and 0 'in use'.

This means that 4 Professional access passes are allocated, but none of the 4 users have logged on yet.

If 1 of those users that were allocated the access pass would log on, the result would be 3 'available' and 1 'in use'.