Signing client's userbase into Azure App Service using client's Outlook OpenID Connect.

Hello,

I am having difficulty setting up sign ins through my client's Outlook to my app.

I want to make sure I am understanding the process corretly.

Process:

1. App Registration - Redirect URI: myapp.azurewebsites.net
2. Identity Provider Connect - Using OpenID Metadata, App Client Id and Secret from (1)
3. App Registration - Redirect URI: https://<YOUR_SITE>/.auth/login/aadb2c/callback
4. Authentication on Web App - Metadata URL: https://<TENANT_NAME>.b2clogin.com/<TENANT_NAME>.onmicrosoft.com/<POLICY_NAME>/v2.0/.well-known/openid-configuration
   Client ID and Secret from (3)

The docs seem to be somewhat dispersed, and this is what I could gather.

https://video2.skills-academy.com/en-us/azure/active-directory-b2c/configure-authentication-in-azure-web-app

https://video2.skills-academy.com/en-us/azure/active-directory-b2c/identity-provider-generic-openid-connect?pivots=b2c-user-flow

https://video2.skills-academy.com/en-us/azure/active-directory-b2c/tutorial-register-applications

However, doing this has been unsuccessful, with errors such as (https://video2.skills-academy.com/en-us/troubleshoot/azure/entra/entra-id/app-integration/error-code-AADSTS50011-redirect-uri-mismatch) and "A claim with id "UserId" was not found, which is required by ClaimsTransformation 'CreateAlternativeSecurityId' in policy 'B2C_1_signin' of tenant.

I would appreciate if you could confirm my understanding of the process, and also if you could offer some help on these errors.

Thanks, Richard