RDP Gateway : Custom Authentication plugin & Default CAP

We have developed a custom authentication plugin for the RDP gateway according to Microsoft provided sample. 

https://code.msdn.microsoft.com/windowsdesktop/Remote-Desktop-Gateway-517d6273

When installing our plugin on a fresh installation of RDP gateway we get an error during the connection (see below).

If we remove the default CAP configuration setup by the RDP installation Wizard and manually configuration a new one then connection succeeds.

How to fix that issue ?

thanks

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Details of the error are below:

The user "domain\user", on client computer "x.x.x.x", did not meet connection authorization policy requirements and was therefore not authorized to access the RD Gateway server. The authentication method used was: "Cookie" and connection protocol used: "HTTP".The following error occurred: "23003". (event ID 201)

<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">

- <System>

  <Provider Name="Microsoft-Windows-TerminalServices-Gateway" Guid="{4D5AE6A1-C7C8-4E6D-B840-4D8080B42E1B}" />

  <EventID>201</EventID>

  <Version>0</Version>

  <Level>2</Level>

  <Task>2</Task>

  <Opcode>30</Opcode>

  <Keywords>0x4010000001000000</Keywords>

  <TimeCreated SystemTime="2015-03-02T14:40:45.403913800Z" />

  <EventRecordID>27</EventRecordID>

  <Correlation ActivityID="{BEA53EF1-7BBF-4973-BA10-445A99070000}" />

  <Execution ProcessID="3912" ThreadID="3028" />

  <Channel>Microsoft-Windows-TerminalServices-Gateway/Operational</Channel>

  <Computer>SAMU.corp.hamilton.com</Computer>

  <Security UserID="S-1-5-20" />

  </System>

- <UserData>

- <EventInfo xmlns="aag">

  <Username>hamilton\fko1</Username>

  <IpAddress>x.x.x.x</IpAddress>

  <AuthType>Cookie</AuthType>

  <Resource />

  <ConnectionProtocol>HTTP</ConnectionProtocol>

  <ErrorCode>23003</ErrorCode>

  </EventInfo>

  </UserData>

  </Event>

Feg HID