Learn the process of how to fix yahoo mail not working on android:
If your Yahoo Mail is not working that means the problem is with the browser, or most probably you are using the outdated version of the Yahoo Mail app.

Here find a complete solution to fix these issues of Yahoo Mail not working on android.

When your Yahoo Mail App Freezes, Crashes, or Responding Slow:

1.  When you are using the latest version of Yahoo Mail & OS.
2.  Clear the cache and app data.
3.  Try to restart the app to refresh the memory of the application.
4.  Uninstall and Re-install the Yahoo Mail app.

All Features Are Not Available on Mobile Devices:
Most of the features of Yahoo Mail are only accessible in the desktop browser version. You cannot use every feature on the Yahoo mail app.

1.  View the full email headers
2.  If you blocked the email addresses
3.  When you send to a contact list
4.  Create vacation responses.

Change the Mobile Number:

If you recently change your old number and still you are using the same phone number. Then you can easily fix this issue by following the below-mentioned steps.

1.  First do sign-in to the Yahoo Mail account.
2.  Now move to the Profile Name > then move to the Account info > head to the Account security.
3.  Following tap on the phone number option and tap to Add recovery phone number.
4.  Provide the phone number in the shown field.
5.  Click to send SMS. You will get an account key on your phone.
6.  Enter the code.
7.  Tap Verify.

Thus, all the points mentioned above are based on yahoo mail not working on android, if required you can call them on their support number to get the answer or feedback.

Reference url: https://mamby.com/post/how-to-fix-yahoo-mail-problems-in-iphone