I had some success with using the host UUID configured. I was able to get the UUID from "https://<hostname>/api/wol/wol/searchhost" call.
When run successfully, I receive a response back of {"status":"OK"}
Code Select
curl -X POST -d '{"uuid":"<UUID>"}' -k -H "Content-Type: application/json" -H "Authorization:Basic <Base64 API key and secret>" https://<hostname>/api/wol/wol/set
When run successfully, I receive a response back of {"status":"OK"}