Enabling vTPM in Openstack

I am trying to add vTPM support to nova-compute in OpenStack. Below attached is the link to the tutorial I am following: https://that.guru/blog/emulated-tpm-in-openstack/ I am using the command: openstack --os-placement-api-version 1.20 resource provider trait list
--format value $RP_UUID | grep TPM By straight running the above command I got the error "Openstack resource provider trait list error: the following argument is required." I cannot resolve this line "where $RP_UUID is the UUID of the resource provider of the compute node, which can be found via openstack resource provider list".