클라이언트 자격 증명 흐름 (데몬)을 사용하여 Microsoft Graph API에 액세스 할 때 "테넌트 GUID에 대한 테넌트가 없습니다."

Outlook 사서함에서 데이터베이스로 메시지를 복사하기 위해 콘솔 응용 프로그램에서 주기적으로 Microsoft Graph에 액세스하고 싶습니다. 프로그래밍 방식으로 인증하려면 Microsoft Graph의 "클라이언트 자격 증명 흐름"을 사용해야했습니다.

내가 취해야 할 단계는 다음과 같습니다.

1. Azure Portal에 앱을 등록하고 이에 대한 클라이언트 암호를 만듭니다.

2. 필요한 모든 권한을 추가하고 액세스 권한을 부여합니다.

   

3. 관리자가 처음 액세스하여 해당 권한을 확인하도록합니다. 이는 다음 URL을 사용하여 수행됩니다.

   https://login.microsoftonline.com/{tenant}/v2.0/adminconsent
   ?client_id={app id}
   &state=1234
   &redirect_uri=https://login.microsoftonline.com/common/oauth2/nativeclient
   &scope=https://graph.microsoft.com/.default
   

   다음과 같은 응답을 받았습니다.

   admin_consent: True
   tenant: ca566779-1e7b-48e8-b52b-68**********
   state: 12345
   scope**: scope: https://graph.microsoft.com/User.Read https://graph.microsoft.com/.default
   

   (The scope might explain the problem described later here: Why do I only get User.Read when I've configured 13 different permissions??)

   

4. Get an access token (with success!):

   

5. Try to read users (with success):

   

6. Try to read my own emails (without success):

   

7. Try to read somebody else's emails (the user was invited to access the app as a guest, but still, no success):

   

I don't understand why I can't read Messages but I can read Users. It seems the permissions were completely ignored (I confirmed that I don't need any permission to read the users).

UPDATE

This is my tenant name:

These are the users added to the tenant:

Important: I don't own an office 365 subscription in my Azure AD. All these emails belong to a different AD.

The previous question "The tenant for tenant guid does not exist" even though user is listed on users endpoint? is similar to mine but I believe this is not a duplicate as my problem is slightly different and the proposed solution uses OAuth1 (I am using OAuth2).