Error Message when getting access code for Google Calendar API with Appointments+

SOLVED: issue with Generate you Access Code. This is what the page says from Google: (FYI - no extraneous spaces for Client ID or Secret)

400. That’s an error.
Error: redirect_uri_mismatch
Application: Elite Agents Network
You can email the developer of this application at:
The redirect URI in the request, urn:ietf:wg:oauth:2.0:oob, can only be used by a Client ID for native application. It is not allowed for the 'WEB' client type. You can create a Client ID for native application at

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Request Details
That’s all we know.
NOTE: Kaisa already helped me brilliantly. I had incorrectly created credentials for a web browser when the correct selection is Other - UI. Everything is working perfectly now.
Refer to here answer here: