Yahoo email - authentication failed

J have an eleven-keys psw. on one of my mail accounts and in the 'Settings','Mail','Accounts' sub-menu j get displayed only nine,so j don't think seeing eight 'spots' on the psw. space should bother you. When j change my yahoo mail psw. what j do is go back to the 'setting' section j already mentioned,erase the old psw. and put in the new one;then j press 'Mail' at the top left corner to make sure it fitted in. At times that way does not work so j delete my account and set up a new one,by both using the set up wizard or even manually by using the 'Add Account' tool. This way(s) helped me to use a new psw. everytime j changed it on my Yahoo mail accounts on the iphone. Not sure if this can help you at all but j thought it might!

 

I ran into this problem yesterday while I was helping a friend set her Yahoo account up. I will see if she wants to try setting her password to something shorter. She currently has a 10 digit password. eoren1 how many digits did you end up using?

 

Change password solution

OK this problem was really bugging me too.

Solution:
go into settings>mail,contacts,calendars

select the yahoo account
enter the new/updated password (you will already have set on a normal computer)
now flick the account on/off switch to off position
hit the back button marked mail (top left)
when it returns to the accounts screen it will start to authenticate and will return a check/tick sign

once done now go back into the yahoo account and turn it back on.

Job done. Silly that this happens though!!