What does it mean when you get a 'group not found' error on Windows using IBM WebSphere MQ?

A "group not found" error in IBM WebSphere MQ on Windows typically indicates that the specified user group for access control or permissions does not exist on the system. This can occur when a queue manager or an application attempts to reference a security group that has been deleted or was never created. To resolve this, check the user group settings in the operating system and ensure that the required groups are properly defined and associated with the appropriate permissions in WebSphere MQ.