Azure B2C: Custom claim isn't written into AAD via custom policy - azure

Question

It seems that I've hit a road block when it comes to writing custom claims to Azure Active Directory (AAD). I'm trying to write the organization into ADD, but it appears that when I query the users via Graph API, I don't see any trace of the organization data. I'm wondering if there's something off with how I attempted to write the data or there's a techincal detail that I'm not aware of that can cause this issue?
Here's the custom claim that I want to save to AAD.
<ClaimType Id="extension_organization">
<DisplayName>Organization Name</DisplayName>
<DataType>string</DataType>
<UserHelpText>Name of admin's organization.</UserHelpText>
<UserInputType>TextBox</UserInputType>
</ClaimType>
And here is where I'm writing the claims (it's pretty much what you would see in the examples):
<TechnicalProfile Id="AAD-UserWriteUsingLogonEmail">
<Metadata>
<Item Key="Operation">Write</Item>
<Item Key="RaiseErrorIfClaimsPrincipalAlreadyExists">true</Item>
</Metadata>
<IncludeInSso>false</IncludeInSso>
<InputClaims>
<InputClaim ClaimTypeReferenceId="email" PartnerClaimType="signInNames.emailAddress" Required="true" />
</InputClaims>
<PersistedClaims>
<!-- Required claims -->
<PersistedClaim ClaimTypeReferenceId="email" PartnerClaimType="signInNames.emailAddress" />
<PersistedClaim ClaimTypeReferenceId="newPassword" PartnerClaimType="password"/>
<PersistedClaim ClaimTypeReferenceId="displayName" DefaultValue="unknown" />
<PersistedClaim ClaimTypeReferenceId="passwordPolicies" DefaultValue="DisablePasswordExpiration" />
<!-- Optional claims. -->
<PersistedClaim ClaimTypeReferenceId="givenName" />
<PersistedClaim ClaimTypeReferenceId="surname" />
<PersistedClaim ClaimTypeReferenceId="extension_organization" />
</PersistedClaims>
<OutputClaims>
<OutputClaim ClaimTypeReferenceId="objectId" />
<OutputClaim ClaimTypeReferenceId="newUser" PartnerClaimType="newClaimsPrincipalCreated" />
<OutputClaim ClaimTypeReferenceId="authenticationSource" DefaultValue="localAccountAuthentication" />
<OutputClaim ClaimTypeReferenceId="userPrincipalName" />
<OutputClaim ClaimTypeReferenceId="signInNames.emailAddress" />
</OutputClaims>
<IncludeTechnicalProfile ReferenceId="AAD-Common" />
<UseTechnicalProfileForSessionManagement ReferenceId="SM-AAD" />
</TechnicalProfile>
On an interesting note, it seems that not even the e-mail can be seen.

Answer 1

When querying the Graph API for custom/extension attributes, you will need to make sure you select the extension attributes with the following syntax:
extension_{b2cExtensionsAppId}_organization
Where {b2cExtensionsAppId} is the Application/Client ID for the application in your B2C tenant that is automatically generated:
b2c-extensions-app. Do not modify. Used by AADB2C for storing user data.
Edit - Remove the dashes (-) from the Extensions Application/Client ID
79af1ae0-cacb-401a-9a42-1f2178adc0ef gets converted to 79af1ae0cacb401a9a421f2178adc0ef.
Example:
b2c_79af1ae0cacb401a9a421f2178adc0ef_organization