If you want to know how to
connect to Yahoo mail, then you need to join Yahoo
Phone Number to get the best information. The support executives
will let you know you need to check your account is working outside of the
application. Then you gave to update the operating system. After that, you have
to remove & re-dd the Yahoo mail to iOS mail.
https://www.att-customerservice.com/yahoo-customer-support-number/
