Since upgrading the ICT Server to 15.1, several users with ICT 7.2.1461.3 are receiving an error when trying to save a file. The classification option doesn't appear and the error states:
"An error occurred while classifying the document. Please try again later or make sure you have the appropriate permission"
Issue in initial release.
Upgrade to 15.1 MP1 and/or try saving the document multiple times to resolve.