Access Error trying to connect to Developer Cohort

I'm working on creating my first test to connect and then run an API call. I am using the PHP Authorization Code Flow demo application. I have been able to created a new application under my developer account and enabled the API subscription. My test site is able to redirect a user to the Blackbaud authorization screen and that looks good:

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Once I authorizes access and am redirected back to my test site but I am unable to get an access token. The call to get the access token is returning an access_denied error message. Here's the JSON response.

{"error":"access_denied","error_description":"The specified credentials were not valid."}

Is there some other set up that is needed to allow access?

This seems like the same issue that another user had and reported here recently.

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