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I am trying to authenticate in order to use Outlook REST API to subscription to Outlook emails via Push Subscription. I am using this documentation for reference: https://docs.microsoft.com/en-us/previous-versions/office/office-365-api/api/version-2.0/notify-rest-operations

I created an app in portal.azure.com and provided Required permission on "Read user mail" under "Office 365 Exchange Online" api.

Grant Required permission of Read user mail Screenshot

I am using the following code to get a Bearer token using "Microsoft.Identity.Client" nuget package. But I am still not able to subscribe to the Outlook Push Notification REST API and I am getting 401 Unauthorized error.

 static async Task<AuthenticationResult> AuthorizeAsync(string clientId)
 {
 var authority = $"https://login.microsoftonline.com/tenantName.onmicrosoft.com";
 var app = new PublicClientApplication(clientId, authority);
 string scopes = new string "Mail.Read" ;
 var accounts = await app.GetAccountsAsync();

 AuthenticationResult authenticationResult = null;
 if (accounts.Any())
 
 authenticationResult = await app.AcquireTokenSilentAsync(scopes, accounts.FirstOrDefault());
 
 else
 {
 try
 
 var username = $"Environment.UserName@microsoft.com";
 authenticationResult = await app.AcquireTokenByIntegratedWindowsAuthAsync(scopes, username);
 

Has anyone worked on a similar issue to authenticate and create a Push notification Subscription to get Outlook emails and can please help?