If Yahoo asks you to use third-party passwords when you are signing in from any other app, like iPhone Mail App. Sign in and go to your Account security page. Click Generate app password or Manage app passwords. For Yahoo Email Problems iPhone, select your app from the drop-down menu and click Generate. Follow the instructions below the password. Click Done. Use this app password and your email address to sign in to your email app. For other common Yahoo mail not working on iPhone issues, you can try the following tips to fix them.

https://www.contactyahoo.us/blog/yahoo-mail-not-working-on-iphone/

https://www.contactyahoo.us/blog/yahoo-mail-not-syncing-on-iphone-mac-android-ipad/

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