Why are Google authentication consent screen buttons disabled on an Android 2.3 phone?

I want to use an old Galaxy Ace which runs Android 2.3 as a camera. I installed the Alfred camera app on it which requires Google login in order to connect the camera and the viewer device securely. I can log in successfully with the Alfred app to Google, but then there is a consent screen to allow the app to access my account data and both buttons are disabled like here on this picture taken from the net. Why is it that loggging in works, but I cannot proceed from the consent screen? How can this be fixed?