How can I retrieve the organisation_id when doing oAuth 2 for testing API calls?

Hello,

I am trying to test my API routes using Insomnia and I have successfully retried an access token using the Oauth 2 feature connecting to my API.

Now I understand that this is a Machine to Machine application (My PC pinging my API) and I’m not logged in, but I have the credentials, but to test as if I am a normal user, but just requesting the API, how can I get an organisastion id? Or am I doing this incorrectly?