Have you set up an integration, but aren't seeing the people in Gloo Workspace that you expect to see? There are a few reasons for the disparity in the number of people in your ChMS and Gloo Workspace.
When a contact in your ChMS has a phone number listed, Gloo only pulls over people with a Mobile phone number.
Check to make sure all your ChMS phone numbers are in the "Mobile" spot of a person's profile instead of marked as "Home."
Gloo only pulls people over that are older than 13.
Check to see if they have a birthday noted in your ChMS. If they are under 13, they will not be brought over.
By default, Gloo only pulls over people that are "active" in a ChMS.
Check to see that the people you want to integrate are still marked as "active."
Note: Gloo now has the ability to pull over contacts with only an email address (no phone number required).