Machine to Machine quota and the example React+API

If you follow the React quick start tutorial and the Calling API by using the SDK to build a SPA, hence using the Authorization Code Grant Flow with PKCE. Will anything in this setup count toward machine to machine quota? Because now, during the trial I built this app, and for some reason have 6 Authentication Calls, Machine to Machine. But I don’t really get why?

API calls doesn’t seem to increase it. Might it be using Postman for testing or can there be other reasons? Just wanna make sure I’m not missing something about pricing here.

M2M quota would only be generated via Client Credentials Grant. So Auth Code Grant+PKCE shouldn’t cause it.
What type of grant type did you use with Postman? (You can also DM me your tenant name, maybe there’s something obvious to see, but not sure.)