This functionality functions exactly how it’s labeled, “It groups Access Keys.” An example to help understand why Access Key Groups should be configured is this: Let’s assume users in the access key Zone F are located in the East Coast region along with Zone G and Zone H access keys. When manager users (those with Roadmap Manager or Metrics Manager roles) work with advisors in SuccessPro, the  may be utilized to allow easier filtering of users. This is especially useful as the number of  increase within over time. 
Click on 
Search for the applicable  in the filter list and click the arrow to enable. 
Here is an example of the  displays  by Chicago, Dallas, & Minneapolis are all access keys and placed in the Central Region group. 
If an access key is not in a group, then it will be set to the section of the data manager.