Register an app group

You’ll need to register one or more groups to enable app groups.

Required role: Account Holder or Admin.

In Certificates, Identifiers & Profiles, click Identifiers in the sidebar, then click the add button (+) on the top left.
Select App Groups, then click continue.
Enter a description and identifier, click Continue, then click Register.

Alternatively, you can create app groups when you enable app groups in Xcode.