Syncing Contact Attributes to B2C Users for PowerApp Portals with Cloud Flows

Note: This article is goes through the process from a Logic app perspective, but in my case I needed to do it in Flow, thanks to the original author.

If you ever used the Power App Portals with the most common authentication mechanism (Azure AD B2C) then you may have come across the problem of portal users frequently changing their email address or contact information or less frequently changing their names from within the portal or by changing these attributes directly in the model driven app by backend users.

The problem with Azure AD B2C user directory is that it doesn’t respect those changes, meaning that those changes don’t reflect back from Dataverse into B2C. The common solution has been custom code. We write a plugin that calls the Graph API to update Azure AD B2C directory. I will follow a similar approach but using a Cloud Flow instead of the plugin, this of course will make any future changes easier and we can add some cool things like retry logic if the request fails or email notification to the administrator etc.


  1. I assume that you have a portal ready and using Azure AD B2C as its authentication mechanism. If you don’t, check out this very new feature on how to set that up using a wizard.
  2. I also assume that you have administrative privileges to add and configure an application registration in the B2C tenant.

The Solution:

We will build a daemon flow that runs on the update of the contact entity (portal user is a contact). This Flow will execute an HTTP request to the Graph API to update that user record in B2C with the new values from Dataverse. Before building the flow, we need a way to authenticate the flow, best way to do that, is to create an app registration that takes care of the authentication and use that app registrations in our flow.

Part 1: Creating the App Registration

Since we don’t have handy connector for the Graph API that does what we want, we need to issue HTTP requests to the API. To issue these HTTP requests, we need to authenticate with the Graph API. Instead of hardcoding a username and password inside the flow, we will use the Application Registration approach.

Navigate to and open the B2C directory that you use to authenticate the portal. (It is important that you are in the B2C directory and not your default one). Make not of the B2C Directory name as we will need it later. Search for the Azure AD B2C directory and open it.

  1. Under App Registrations, click New registration.

2. Give your app a name and make sure to select the last option as we are already using user flows to authenticate portal users who mostly will be from outside our organization. Click Register when done.

3. After creating the Application, take note of the Client ID and Tenant ID that appear in the application registration overview page, we will need them later.

4. We need to create a secret for this app as the flow needs it for the HTTP request authorization header. Click on Certificates & Secrets from the left pane, under the Client secrets, click New client secret. Give the secret a name and an expiry date and click Add. When the secret is added, you have one chance to copy its value as it will be hidden from you if you navigate from this page. So, for now, we have the B2C Directory name, Client ID, Tenant ID, and the Secret values saved on the side.

5. This app is almost ready, we just need to fatten its permissions to make it capable of managing some aspects of the B2C tenant that will allow us to solve our problem. Click on the API permissions that you see in the left pane of the previous image and then click on Add a permission.

From the dialog on the right, choose Application permissions because our Flow will be a background process and choose the following permissions ( you can search by permission name):

User.ManageIdentieis.All, User.ReadWrite.All, Directory.Read.All

When you add these permission, make sure to click on “Grant admin consent for YOUR-TENANT_NAME”. Now we are already, let’s move to the Flow side.

Part 2: Creating the Flow

The flow is really simple, use the current environment trigger and configure it to run on update and scope it to organization. All these variables will hold the values we collected previously, you should have everything handy by now except for Auth Audience URI with should be Since we only want this flow to work for contacts who are actually portal users, I’m checking the User Name field on the contact entity. In Dataverse, the contact record has a field called User Name which hold a GUID that represents its Azure AD B2C ID.

Now, for the HTTP action, make sure that the method is PATCH since we will be only updating pieces of the user record. For the URI, you need to use{Contact Record User Name}.

For the Headers, we need the Authorization header and the Content-Type header. The Authorization is basically the secret we got from the previous steps. The Content-Type is hard-coded as application/json.

We are not done yet with authentication, if you click on advanced settings at the bottom, you need to configure the authentication as shown below using the same variables we collected before.

Now the last part, the body of the PATCH request. In my case, I’m interested in the Email (mail) , First Name (givenname) and last name (surName) because those are the only fields I mapped when I configured the B2C authentication for my portal. This means that if the contact changes their name or email, the corresponding B2C user will get those changes in few seconds as well. For more info on the schema of the JSON you see above in the body field and if you are interested in updating other fields, refer to this documentation.

That’s it! We are now good to go, go and an update a portal user email, first name or last name in the portal profile page or directly in the Model-driven app. In few moments, the changes should reflect in the B2C directly. Here is a very short demo of how this works:

Below is an example video of how this works: