This is an ongoing problem even with version 2005 on-premise. When this occurs the allocation numbers have to be adjusted but the first screen won't let you get to the assignment page. The workaround is to skip the first screen in the app configuration by instead putting a check mark by the app in the app list and select "ASSIGN" then adjusting the allocation numbers to make sure you have some Unallocated . It is tied to the old "Externally Redeemed" issue that can't be seen in the console any more but has this symptom. This old instruction may help: VMware Knowledge Base