login/oauth2/token is not being found?

I am getting an error with my application that is confusing me. The POST call on the app to get the authorization token is not going through and the error is giving me a 404. This is the link that is...

Is the client_id and the consumer key the same thing?

I am starting to learn about the OAuth workflow for my first LTI and I have to pull information from the API. However, I am completely stuck. I know the Consumer Key and the Consumer secret are agree...