After creating your application, you need to set the correct permissions. Navigate to <the newly created application> | Required permissions | + Add. In the Select an API list, select Dynamics CRM Online (Microsoft.CRM), followed by Select. In the second step, click on Access CRM Online as organization users followed by Select. Finally, click on Done.
Once the permission is created, select it from the list and click on Grant Permissions to grant permissions to all users.
Failure to grant permission to all users will result in an AADSTS65001 error in our console application (the user or administrator has not consented to use the application with the ID).
If you are building an end user application (mobile, desktop, and so on), it is recommended that you do not click on the Grant Permissions button. This will not grant all users permissions by default and will prompt them for approval the next time they log in.