Static webapp problem - No reply address provided

Question

I am hosting an Angular Single Page Application (SPA) on Azure Static Web Apps, and I am trying to enable Azure Active Directory (AAD) authentication for the front-end. Despite configuring the app registration and Azure Static Web App settings, authentication fails, and users are unable to log in.

Details

1. Application Overview

• Front-end: Angular SPA hosted on Azure Static Web Apps.
• Backend APIs: Accessed via separate services (currently not secured; only front-end authentication is being implemented).
• Authentication Provider: Azure Active Directory (AAD).

2. Steps Taken

• Created an Azure AD App Registration for the SPA.
• Configured Redirect URIs for the SPA under Single Page Application:
  • https://mc-app-tst.lantmannen.com/.auth/login/aad/callback
  • https://mc-app-test.azcn.lantmannen.com/.auth/login/aad/callback

• Updated the staticwebapp.config.json file to enforce authentication with the following configuration:

{

"routes": [

    {

        "route": "/*",

        "allowedRoles": [

            "authenticated"

        ]

    }

],

"responseOverrides": {

    "401": {

        "redirect": "/.auth/login/aad",

        "statusCode": 302

    }

},

"auth": {

    "identityProviders": {

        "azureActiveDirectory": {

            "registration": {

                "openIdIssuer": "https://login.microsoftonline.com/<TENANT_ID>/v2.0",

                "clientId": "<CLIENT_ID>"

            }

        }

    }

},

"navigationFallback": {

    "rewrite": "/index.html",

    "exclude": [

        "/*.{png,ico,svg}",

        "/assets/*"

    ]

},

"forwardingGateway": {

    "allowedForwardedHosts": []

},

"networking": {

    "allowedIpRanges": [

        "0.0.0.0/0"

    ]

}
```}

Issue Observed

- When accessing the app, users are redirected to the Azure AD login page.

- After login, the authentication process fails with the following error:

  - **Error Code**: `900971`
  
  - **Error Message**: "No reply address provided."
  
- Azure AD Sign-In Logs show that MFA is completed, but the error indicates that no valid reply address is provided:

  - **Application**: `App-ConNy-Login-TST`
  
  - **Failure Reason**: No reply address provided.
  
  - **Sign-in error code**: `900971`.
  
![User's image](/api/attachments/b688a825-3b14-4107-9f32-a85a37813947?platform=QnA)



I've added the corresponding redirect URIs to my App Registration.

Could you see the problem why is says "No reply address provided" even though i've clearly added these