Getting error code 4300 and previous posts do not indicate it can be easily fixed

[edshoe]

Hi I have tried deleting and re-installing the Vodafone app on my iPhone SE, but it does not recognise my details, yet my account accessed via a Mac seems fine. Please advise what I need to do. Thanks

[BandOfBrothers]

Are you able to uninstall the app from your  iPhone and your iTunes library and if possible icloud and then re install a fresh copy ? 

@edshoe 

🌈 Stay Safe & Stay Alert.  🌈

[edshoe]

I don't believe it's in iTunes or my iCloud, but have deleted and reinstalled several times on the phone... It sends a code to my number OK to access the app,, but then cannot find any of my details when it's launched, yet it has my mobile number on one of the screens as well as my account number, so it know's it's me, but cannot link the account data for some reason