Reactive email

I need help! I have an old yahoo email account that I can't reactive in my iPhone. I didn't change anything and the password is the same for all devices. It works on the iPad but not on the PC or iPhone. Tried several times to restore it and it gives me an error message "unable to recuperate account" use online services saying forgotten password to try with a new one and again no luck! tried deleting the account and restoring again no deal, but it works on the iPad. Any ideas?
 
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