Faced similar issue. Maybe my issue and idea will help you.

First try same steps from horizon.

Second. In cli, i used same name as hypervizor list output.

In most cases for me it is: $stackName-$roleName-$index.localdomain if forget to change localdomain value ;))

My faced issues were related, tah one compute can be in one zone, and multiple aggregation groups in same zone.

Note:

Interesting that you use nova blah-blah, try openstack aggregate create zonename --zone zonename

And same with openstack aggregate help see help how to add it with openstack.

Hope this helps at least a bit.