Devices with agent installed show as Device Agent Not Ready - Error: "Unable to poll for jobs; will retry" (4369158)

Devices with agent installed show as Device Agent Not Ready - Error: "Unable to poll for jobs; will retry"

Active Directory Device Migration Devices with agent installed display as Not Ready in the portal.
devices have the software running , but will not turn up ready , see attached file
12:14:53.7645747 - Info[4]: Current cache polling interval is 120 seconds.
03:42:42.1020633 - Error[33]: Unable to poll for jobs; will retry...
07:42:41.7834831 - Error[47]: Unable to poll for jobs; will retry...
11:42:41.6374138 - Error[97]: Unable to poll for jobs; will retry...

In one specific case, the error contained "MediaTypeFormatter" HTML error because service URL was populated with Mimecast filtering URL. 

The Product Service URL and/or Auth Key were not correctly entered during agent install.
or
A proxy server or firewall is blocking the agent from communicating.

From the ODMAD Configuration | Downloads page.

Copy and paste the Product Service URL and/or Auth Key to notepad to ensure no trailing spaces are included.

or

Resolve communication issues caused by a proxy server, and/or firewall, etc.
Agent connections are initiated by the agent and require port 443 access to Directory Sync SaaS application.From our online documentation https://support.quest.com/technical-documents/on-demand-migration/current/active-directory-user-guide/10#TOPIC-1601741

By default, each computer being migrated will require outbound access to the public Internet to securely communicate with the Power365/ODM-AD services.

Important Tip: If your organization requires computers communicate externally using a web proxy see our web proxy configuration requirements.
Application Ports  

Each computer being migrated will require the Active Directory device agent and this agent will communicate to the Power365/ODM-AD services services, outbound over ports:
 

• 80
• 443
• 3030

Web Proxy:  Some organizations may require all computers communicating externally direct their traffic through a web proxy to centralize communications. Active Directory agents can be configured to use a web proxy for communication to the Power365 cloud services.

Proxy Server:  At least one (1) standard web proxy that supports http/TCP traffic.

Proxy Address: The associated web proxy URL must be defined during configuration of the device agent.

Security: If accessing the web proxy requires an additional username and password this will be required during configuration of the device agent.

Ports:  All agents configured to use a web proxy will utilize the following outbound TCP ports:
 

• 80
• 443

Please Note:  Agents configured to use a web proxy will not require UDP port 3030. For more information, see the Web Proxy Configuration under Architecture.

If only URL was incorrect, it's possible to modify it directly in regedit, without reinstalling the whole agent. Location is: HKLM\Software\Wow6432Node\Quest\On Demand Migration For Active Directory\ODMAD_AD\
Modify ServiceURL value with the correct URL and restart the agent service.