Had similar issue due to typo in DNS.
Once the DNS is fixed, the status straight away changed from "Waiting for host to trigger.." to "In progress ..."
Bayu Wibowo | VCIX6-DCV/NV
Author of VMware NSX Cookbook http://bit.ly/NSXCookbook
https://github.com/bayupw/PowerNSX-Scripts
https://nz.linkedin.com/in/bayupw | twitter @bayupw