HI @danielta15 ,
The purpose of having the option to stream Web/App data to Profile Dataset using Datastream are mentioned below:
- Capture User Consent & Preference Information.
- Capture Push Notification details.
- Capture Region Data for Target Use-case.
Note: You do not need to intentionally populate any of the fields in this dataset as part of their Web/Mobile SDK implementation. It will all be handled automatically.
Also, the schema must be enabled for profile.
Your schema should contain the below field groups as per the requirement.

Hope this helps.
Regards,
Kumar Saurabh