Unable to pass query param to azure-ad-b2c custom policy and store values

Question

I have a scenario where i have to pass a query parameter in the URL to my custom sign-up policy and so far all my attempts did not work. there seem to be something that i am missing following the guidelines i found in github. I am trying to pass LoyaltyNumber and i have this attribute defined in my policy as extension_LoyaltyNumber. Below is the snippet.

my custom signup policy

<RelyingParty>
<DefaultUserJourney ReferenceId="SignUp" />
<UserJourneyBehaviors>
<ContentDefinitionParameters>
<Parameter Name="LoyaltyNumber">{OAUTH-KV:LoyaltyNumber}</Parameter>
</ContentDefinitionParameters>
</UserJourneyBehaviors>
<TechnicalProfile Id="PolicyProfile">
<DisplayName>PolicyProfile</DisplayName>
<Protocol Name="OpenIdConnect" />
<InputClaims>
<InputClaim ClaimTypeReferenceId="email" />
<InputClaim ClaimTypeReferenceId="extension_LoyaltyNumber" />
</InputClaims>
<OutputClaims>
<OutputClaim ClaimTypeReferenceId="displayName" />
<OutputClaim ClaimTypeReferenceId="givenName" />
<OutputClaim ClaimTypeReferenceId="surname" />
<OutputClaim ClaimTypeReferenceId="signInNames.emailAddress" PartnerClaimType="email" />
<OutputClaim ClaimTypeReferenceId="objectId" PartnerClaimType="sub"/>
<OutputClaim ClaimTypeReferenceId="tenantId" AlwaysUseDefaultValue="true" DefaultValue="{Policy:TenantObjectId}" />
<OutputClaim ClaimTypeReferenceId="extension_ValidPassword" />
<OutputClaim ClaimTypeReferenceId="extension_LoyaltyNumber" AlwaysUseDefaultValue="true"/>
</OutputClaims>
<SubjectNamingInfo ClaimType="sub" />
</TechnicalProfile>

in my TrustFrameworkExtension.xml, i have defined it in the Local Account as follows

<ClaimsProvider>
<DisplayName>Local Account</DisplayName>
<TechnicalProfiles>
<!--Local account sign-up page-->
<TechnicalProfile Id="LocalAccountSignUpWithLogonEmail">
<Metadata>
<Item Key="IncludeClaimResolvingInClaimsHandling">true</Item>
</Metadata>
<InputClaims>
<InputClaim ClaimTypeReferenceId="extension_LoyaltyNumber" AlwaysUseDefaultValue="true" DefaultValue="{OAUTH-K:LoyaltyNumber}" />
</InputClaims>
<OutputClaims>
<OutputClaim ClaimTypeReferenceId="email" PartnerClaimType="Verified.Email" Required="true" />
<OutputClaim ClaimTypeReferenceId="newPassword" Required="true" />
<OutputClaim ClaimTypeReferenceId="reenterPassword" Required="true" />
<OutputClaim ClaimTypeReferenceId="displayName" />
<OutputClaim ClaimTypeReferenceId="givenName" />
<OutputClaim ClaimTypeReferenceId="surName" />
</OutputClaims>
</TechnicalProfile>

   <TechnicalProfile Id="SelfAsserted-LocalAccountSignin-Email">
       <Metadata>
        <Item Key="setting.showSignupLink">false</Item>
      </Metadata>
    </TechnicalProfile>

  </TechnicalProfiles>
</ClaimsProvider>

i also have it in the building bolocks section as...

<BuildingBlocks>
<ClaimsSchema>
<ClaimType Id="extension_LoyaltyNumber">
<DisplayName>Loyality-Number</DisplayName>
<DataType>string</DataType>
<UserHelpText>Your loyality from your membership card</UserHelpText>
</ClaimType>
</ClaimsSchema>
</BuildingBlocks>

i have it also to write to Azure Active Directory claims provider section as follows

<ClaimsProvider>
<DisplayName>Azure Active Directory</DisplayName>
<TechnicalProfiles>
<TechnicalProfile Id="AAD-Common">
<Metadata>
<!--Insert b2c-extensions-app application ID here, for example: 11111111-1111-1111-1111-111111111111-->
<Item Key="ClientId">11111111-1111-1111-1111-111111111111</Item>
<!--Insert b2c-extensions-app application ObjectId here, for example: 22222222-2222-2222-2222-222222222222-->
<Item Key="ApplicationObjectId">22222222-2222-2222-2222-222222222222</Item>
</Metadata>
</TechnicalProfile>

    <TechnicalProfile Id="AAD-UserWriteUsingLogonEmail">
      <PersistedClaims>
        <PersistedClaim ClaimTypeReferenceId="extension_LoyaltyNumber" />
      </PersistedClaims>
    </TechnicalProfile>

    <TechnicalProfile Id="AAD-UserReadUsingObjectId">
      <OutputClaims>
        <OutputClaim ClaimTypeReferenceId="extension_LoyaltyNumber" />
      </OutputClaims>
    </TechnicalProfile>

  </TechnicalProfiles> 
</ClaimsProvider>

And the redirect happens from my web application using the following method

public void SignUpNewUser()
{
if (!Request.IsAuthenticated)
{
var authenticationProperties = new AuthenticationProperties();
authenticationProperties.Dictionary.Add("LoyaltyNumber", "556677");
authenticationProperties.RedirectUri = "/";
HttpContext.GetOwinContext().Authentication.Challenge(authenticationProperties, Startup.SignUpPolicyId);

        }
    }

The result i am getting after the user sign-up for the custom attribute extension_LoyaltyNumber is {OAUTH-K:LoyaltyNumber}

Somehow the value 556677 i pass as a query param is not getting to this custom attribute and get stored in Azure user attribute

Can you help?

Thanks