When deploying a group, group members are missing? How to deploy group members?It is possible to deploy groups, but not its group members given limitations of the Metadata API. See reference:
Deploying the group members in a data deployment step is also not possible since Copado requires that the GroupMember object has an ExternalId field, and Salesforce does not allow custom fields in the GroupMember object.
The only option given by Salesforce is to use the Data Loader by following the steps detailed in the link below: