Register-SPWorkflowService - The remote server returned an error: (500) Internal Server Error

Question

In a multi-server FARM deployment, I’m struggling to get the workflow manager to finalise via the PowerShell command, Register-SPWorkflowService. 
When executing the command (Register-SPWorkflowService – SPSite
http://[FQDNSite] –WorkflowHostUri http://[FQDN]:12291/ -AllowOAuthHttp –Force), I get the error mentioned in the title. 
When digging deeper into the logs (Applications and Services
à Microsoft Workflow à Operations) I get the following warnings and errors:
(Warning)
Failed SQL command after 1 tries with error '18456'. Exception: System.Data.SqlClient.SqlException (0x80131904): Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'.
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
(Error)
Error processing management request. Method: GET, RequestUri: http://[FQDN]:12291/ServiceManagement/$System/$Metadata/json/1/, Error: System.Data.SqlClient.SqlException
(0x80131904): Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'.
It is my understanding that the PowerShell command takes the context of the logged on user for this command. 
I’m logged in as “FARM” account and the script window was opened under “Run as Administrator” instruction.
All checks have been completed and all services are running as expected. 
GET-WFFarm and GET-WFFarmStatus returns normal.  All services are running under domain accounts with sufficient privileges. 
Workflow Manager CU2 to get 1.0 Refresh and Workflow Manager 1.0 Refresh is currently NOT installed as it didn’t work before when these updates
were installed. 
Under the CA patch level page, I did pick up the following KB being required under Microsoft Workflow Solutions Framework (http://support.microsoft.com/kb/2880963). 
Installing this is my next step.
Is there anything else I should try or is the patch the next best step?
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Answer 1

Looks like C# code and you've posted to the Visual Basic forum.
Anyway, an error 500 means that there is a problem accessing the resource in the web request. There could be many reasons for this so I would verify that the web request is correct first and if it continues to fail then the resource (web page?) needs to
be fixed before your code will function.
Visual C# forum
Paul ~~~~ Microsoft MVP (Visual Basic)