Unable to Login to Yahoo Mail account after password change
Having changed my BT password on my PC I tried to change it on my iPhone 6, 7 and iPad and I cannot re-set it. Yahoo (BT) say it's an Apple problem, Apple say it's a Yahoo (BT) problem. I've turned the phone on and off repeatedly, changed password again, removed then reinstalled the Mail app, nothing works for my Yahoo account. I get the same error messages every time from Yahoo..."Uh-oh! Looks as if something went wrong. Please try again later." I'm now 4 days down the line with the same issue. Has anyone else had this problem please and how have they resolved it? Incidentally I can log onto my BT Yahoo Email account via the web browser without issues.Thanks
iPhone 7, iOS 11.4