OMEVV Plugin: Client is temporarily blocked for too many unsuccessful authentication

Installed the OMEVV Plugin in OME and pointed it to our vCenter environment with admin creds. vSphere client plugin dashboard shows "Client is temporarily blocked for too many unsuccessful authentication attempt."

Hosts tab thows a "vCenter with UUID XXXX-XXXX-XXXX-XXXX-XXXXXX is not registered. pop up.

Pretty much everything is non-functional with the plugin.