bit of a wierd one this. Was re-authing a few applications today when i noticed some odd behaviour. Whenever i tried to login over my wifi the auth would fail and the app would report there was no internet connection. If i turned off wifi and use 4g I can authenticate fine. I initially had the problem on the main Amazon app but have since seen it on BBC News, BBC Sport, Autotrader App, Sky Go and others. Easily solved by turning off wifi briefly and logging in over 4G but seems very odd. Had no issues on my S9 so hoping this is a known issue and there is a workaround. Would try and diagnose further but not sure where to start.