post https://api.safetyculture.io/groups//users/v2
The Add User to Group
endpoint allows any user with Platform management: Groups
permission to add a user to a group within their organization.
A user can only be added to a group within the requesting user's organization and only users within the requesting user's organization can be added to a group.
The endpoint returns a list of all users in the group after the add user operation is complete.