CDISC5004E

You cannot create the following instance: instance_name. An instance with that name already exists in the following domain: domain_name.

The instance name must be unique for the instance owner across all the instances that are configured for all the versions of the product.
To see a list of all the instances that you own, use the --all option on the streamtool lsinstance command. Specify a unique instance name and try the request again.