Application registration microsoft-dynamics-crm  Here is Guide How to Get client_id   

 Create account here and log in it will display following dashboard



Click On  Azure Active Directory Tab 

Azure Active Directory

Now It will Open Following window and click on App registration.

Azure Active Directory

Create new Application registration

 Application registration

Now Go to App Page and click on Required permission.

Add Required Permission as Below


Now you have to click on Grant Permissions

Now you can get  client_id  as  Application ID 

Application ID