AD B2C compareClaims throws internal server error - azure

Question

I am trying to compare 2 claim (one from id_token_hint and one from AD B2C) . My requirement is to throw an Error Page that the 2 do not match and re-direct to login page.
For the same I have added the following steps :
Added ClaimType (boolean for comparison)
<ClaimType Id="agencyClaimMatch">
<DisplayName>Verify if input Agency and agency in AD B2C match</DisplayName>
<DataType>boolean</DataType>
<UserHelpText>Verify if input Agency and agency in AD B2C match</UserHelpText>
</ClaimType>
Create a ClaimTransformation (based on post to compare the 2 claims (extension_agency from AD B2C and agency from input claim of id_token_hint)
<ClaimsTransformation Id="checkSameAgency" TransformationMethod="CompareClaims">
<InputClaims>
<InputClaim ClaimTypeReferenceId="extension_agency" TransformationClaimType="inputClaim1"/>
<InputClaim ClaimTypeReferenceId="agency" TransformationClaimType="inputClaim2"/>
</InputClaims>
<InputParameters>
<InputParameter Id="operator" DataType="string" Value="EQUAL"/>
<InputParameter Id="ignoreCase" DataType="string" Value="true"/>
</InputParameters>
<OutputClaims>
<OutputClaim ClaimTypeReferenceId="agencyClaimMatch" TransformationClaimType="outputClaim"/>
</OutputClaims>
3.Added a Technical Profile to invoke the transformation (I am expecting the agencyClaimMatch boolean to get a true or false value based on the transformation, if false bot do not match need to throw the error page else allow access)
<TechnicalProfile Id="CheckAgencyMatch">
<DisplayName>Check Agency Match</DisplayName>
<Protocol Name="Proprietary" Handler="Web.TPEngine.Providers.SelfAssertedAttributeProvider, Web.TPEngine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<Metadata>
<Item Key="RaiseErrorIfClaimsPrincipalDoesNotExist">true</Item>
</Metadata>
<IncludeInSso>false</IncludeInSso>
<InputClaims>
<InputClaim ClaimTypeReferenceId="agency" Required="true" />
<InputClaim ClaimTypeReferenceId="extension_agency" Required="true" />
</InputClaims>
<OutputClaims>
<OutputClaim ClaimTypeReferenceId="agency"/>
<OutputClaim ClaimTypeReferenceId="extension_agency" />
<OutputClaim ClaimTypeReferenceId="agencyClaimMatch"/>
</OutputClaims>
<OutputClaimsTransformations>
<OutputClaimsTransformation ReferenceId="checkSameAgency"/>
</OutputClaimsTransformations>
</TechnicalProfile>
In UserJourney I added a ClaimExchange to get the value of checkSameAgency.
<!--Verify claims match and get the boolean value-->
<OrchestrationStep Order="6" Type="ClaimsExchange">
<ClaimsExchanges>
<ClaimsExchange Id="CheckAgencyMatch" TechnicalProfileReferenceId="CheckAgencyMatch"/>
</ClaimsExchanges>
</OrchestrationStep>
If boolean output checkSameAgency is not "True" that is both agencies do not match then throw an error else move to next step to issue jwt token .
<!-- Check if agencID Match-->
<OrchestrationStep Order="7" Type="ClaimsExchange">
<Preconditions>
<Precondition Type="ClaimEquals" ExecuteActionsIf="false">
<Value>agencyClaimMatch</Value>
<Value>True</Value>
<Action>SkipThisOrchestrationStep</Action>
</Precondition>
</Preconditions>
<ClaimsExchanges>
<ClaimsExchange Id="SelfAssertedAgencyNotMatched" TechnicalProfileReferenceId="SelfAssertedAgencyNotMatched" />
</ClaimsExchanges>
</OrchestrationStep>
But I am getting an error "The page cannot be displayed because an internal server error has occurred." even if the agency matches or if they don't.
Any pointers would be very helpful.
===
Following solution as suggested by rbrayb helped resolve the issue .
I noted:
<TechnicalProfile Id="CheckAgencyMatch">
<DisplayName>Check Agency Match</DisplayName>
<Protocol Name="Proprietary" Handler="Web.TPEngine.Providers.SelfAssertedAttributeProvider, Web.TPEngine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<Metadata>
A SelfAssertedAttributeProvider is only used to display a screen, but you are only comparing claims. It should be
<Protocol Name="Proprietary" Handler="Web.TPEngine.Providers.ClaimsTransformationProtocolProvider, Web.TPEngine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
https://learn.microsoft.com/en-us/azure/active-directory-b2c/claims-transformation-technical-profile

Answer 1

<TechnicalProfile Id="CheckAgencyMatch">
<DisplayName>Check Agency Match</DisplayName>
<Protocol Name="Proprietary" Handler="Web.TPEngine.Providers.SelfAssertedAttributeProvider, Web.TPEngine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<Metadata>
A SelfAssertedAttributeProvider is only used to display a screen, but you are only comparing claims. It should be
<Protocol Name="Proprietary" Handler="Web.TPEngine.Providers.ClaimsTransformationProtocolProvider, Web.TPEngine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
Refer this.