I created a new application in the admin portal, under access rights. However, this application did not appear on the IDM portal.
Release : 14.4
If User A can see everything and User B can see only App Group 1, this could be because also needs permission in Identity Manager scope to see objects that become to App Group 2 and because this does not show to him.
The permissions in Identity Manager side were divergent. A group name has been modified in IM side causing the issue. After fixing the divergencies of permissions all Applications in Identity Portal shows as expected.