You also might want to check if you don't have the box checked for "Automatically Populate Purchased Content" in the VPP instance. If that's not checked then you have to manually add your apps to the app catalog.
You know Jamf does have a support chat so instead of going here you can chat with them to get a more immediate support. Anyways in Jamf:
A red number in the Total Purchased column indicates that content has been purchased but is not yet available in Jamf Pro.
yes....so i just did a little test and I purchased one license for the app I need that is not coming through and 1 license of a random app,. and the random one came through the one i need did not...crazy.
This is probably a bit late, but for the benefit of Google.
Check that you don't have the App in the Trash already, I had this issue and couldnt work it out until I checked the Trash and found another listing of the App with all the licences assigned to it.