Are you getting a "callback error" when trying to log into the Teamup app on an Android device? Here are two things to check.
If you are using a Samsung phone, go to Settings > Apps > Teamup. Under Set as default, make sure the option to Open supported links is toggled ON as shown here: Â Â 2. Some browsers do not open the Teamup login page properly. We've had reports that Opera causes an error, while Chrome works fine. Switch your default mobile browser to a different one and try logging into the Teamup app again. (Once you've successfully logged into the app, you could revert to your preferred browser.)