Getting started using a new system is hard. We are all busy, and adopting a new system takes time and effort to understand and make it an intuitive part of your workflow where relevant.
Up until the point where people have automated its use, they are likely to need some nudging in using the platform.
You can easily discover who needs nudging and where by Monitoring activity.
Use this information to talk to the people who aren't using the platform in accordance with what is currently expected of them, to better understand what is holding them back.