Problem with accessing intra-day time series data from Fitbit Surge

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I am trying to follow along a tutorial for accessing the intra-day time series of my Fitbit Surge:

I selected the “Callback-URL”: in the registration page of my app.

When I opened the “OAuth 2.0 tutorial page” in my browser, I inserted the credentials of my App into the page. I used the “Redirect URI”: Then, I clicked on the generated authorization link.

When the new page opened inside the browser, I got the following error message string displayed instead of a result: “Developer information: invalid_request - Missing parameters: client_id”

I do not understand why this problem occurs, as I took the “OAuth 2.0 Client ID” from the app as the client ID.

Can anyone help who also went into this issue?