Hi Meghana,
Just to be clear having machine learning enabled and having ML training are 2 different things. The first is enabled by document type and has not connection to classification, the second is done in a system configuration file and will change whether your environment can create new ML Capture models (and classification models).
I can't think of any other reason, so I would recommend raising a support ticket. We will then be able to review this in more detail and give you direct support.
Thanks
Ben
Ben Lyons
Principal Product Specialist - Decipher
SS&C Blue Prism
UK based