Try to update the setting roaming enabled in the device. sometimes we might forget about it. its not a default optoin as such in the devices. Please try to enable and restart your phone
1) you can try to force stop the app and check once2) check user name password sometimes there might be typo errors. 3) if you are able to login in the website . Give it sometime for the app if it gives errors. try to remove it and try to reboot your...