Last updated April 10, 2019
UPDATE 6/8/16: We have been receiving indications that this issue, while rare, may still exist on some devices. We will update this article as we learn more. Feel free to comment below if you have additional feedback.
Apple release iOS version 9.3.2 this afternoon. A notable fix for SimpleMDM customers is listed in the update notes:
“Fixes an issue that prevented MDM servers from installing Custom B2B apps”
Previously, iOS 9 had a bug that prevented Custom B2B VPP licenses from being assigned directly to devices using device-based license assignment. Devices would simply respond with a misleading “The iTunes Store ID of the application could not be validated” message.
As a workaround, MDM administrators were forced to use Apple ID User-based VPP assignment or redemption codes, the latter not being supported for devices and organizations in some countries. This bug affected all MDM solutions offering device-based VPP licensing support.