Developer information: invalid_request - Invalid redirect_uri parameter value

[JonFitbit]

Are you doing this in a Fitbit OS app, or in a native mobile app?

[instingo]

it is happening in browser. I create app in fitbit developer and then add
the keys in my browser app, and then user logs in, tries to give
permissions but sees the error above.

[Gordon-C]

Hi @instingo 

The redirect_uri value needs to exactly match the value entered when registering your application at dev.fitbit.com.   Also, the URL needs to be absolute.  This means you need to provide the host and a location.   For example, https://www.example.com/callback.

Gordon