JS sample is not fully working

"Get Profile" functionality doesn't work OOTB.

Steps to reproduce:
* Create a new Adobe account
* Create a new project in dev console
* Create a new oauth integration
* Follow https://github.com/AdobeDocs/adobeio-auth/tree/stage/OAuth/samples/adobe-auth-node and setup sample app locally
* Click "Log In with Adobe"
* Click "Get Profile"

✅ Expected result: user information is displayed
❌ Current result: Error in browser and nodejs console

Start with the OAuth sample at OAuth/samples/adobe-auth-node and reproduce the Get Profile failure using the listed Adobe account and project setup. Inspect the browser and Node.js console errors, then verify that clicking Get Profile displays the user information without errors.

Written by the indexing model from the issue text.