To fix Yahoo Mail Not Working on iPhone, you can try to sign out and then again sign in to your Yahoo account. For that, go to Yahoo mail and then Sign out of your account. Open Yahoo mail and then sign in again with the correct username and password. If you are using an obsolete version of the browser, then Update your iPhone to the latest iOS versions to fix the issue.
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Fix problems with Yahoo Mail in iOS Mail
Update your operating system. Apple updates their system anytime they detect and fix an issue. ...
Remove and re-add Yahoo Mail to iOS Mail. Both Yahoo and Apple work constantly on updating their apps and systems. ...
Use the Yahoo Mail app.