Although this should not be relevant to the error in question it’s worth noting that the PhoneGap quickstart is community maintained and may not be up to date. The reason I mention this is that the use of InAppBrowser is not recommended and has been replaced by the use of auth0-cordova as seen in some other quickstarts.
Having said that and going back to the error in question you seem to have added the https://matchday-app.eu.auth0.com/mobile callback in the application settings like instructed in the quickstart, but then the code is making use of window.location.href to set the redirect URI instead of the previous URL so at first glance this is unexpected although I admit I never used the InAppBrowser approach that much to say this would be for sure the problem.