When using B2C Login with Power Pages, with Cloudmersive Reverse Proxy deployed in front of Power Pages, we provide recommended configuration steps:

In Azure AD B2C (App Registration → Authentication)

Be sure to set your redirect_uri to the appropriate Redirect URL for your Cloudmersive Reverse Proxy application endpoint, e.g. https://myapp.cloudmersiveproxy.io/signin-yoursigninnamehere. This is important so that B2C Login will permit redirecting to the Reverse Proxy endpoint which is typically different. Note that if you are using a custom domain name you will want to use that here.

In Power Pages (Identity provider → Azure AD B2C)

1. Open your site

• Go to Power Pages
• Open the site you want to configure

2. Go to the identity provider list

• In the left navigation, click Security
• Click Identity providers

3. Open the Azure AD B2C provider settings

• Find Azure Active Directory B2C
• Click it (or use the … menu on the row and choose Configure)

4. Navigate to the site settings section

• Step through the configuration screens until you reach the section that contains the site/provider settings (commonly labeled something like Configure site settings or Enter site settings).
• On that screen, you should see fields such as Authority, Client ID, and Redirect URI.

5. Set the Redirect URI

• Click into the Redirect URI field
• Enter the redirect URL that matches your Cloudmersive Reverse Proxy Endpoint, e.g. https://myapp.cloudmersiveproxy.io/signin-yoursigninnamehere
• Make sure the full URL is correct (scheme https://, hostname, and any path), and that it matches what you intend B2C to call back to after login

6. Save

• Click Confirm (or Save, depending on what the UI shows)
• Close the dialog