Comment 8 for bug 2077009

You need to specify the destination host for the evacuation,

openstack --os-compute-api-version 2.29 server evacuate --host devstack-compute1 7b21820d-31db-4927-833e-d8f065e40da8

This will result in following error:
...
Sep 03 14:41:17 devstack-control nova-conductor[255596]: ERROR oslo_messaging.rpc.server nova.exception.NoValidHost: No valid host was found. Unable to move instance 7b21820d-31db-4927-833e-d8f065e40da8 to host devstack-compute1. The instance has complex allocations on the source host so move cannot be forced.

Sorry, when I write a bug description I thought that duplicit claims is the error and don't include how to fully reproduce whole behaviour.