FIX IT! All kinds of continual errors attempting to retrieve and read mail.
Suggest hiring IT and web designers who know how to properly test and implement upgrades BEFORE making them live to users.
1st
ranked

If you still find that the issue is happening, please see this help page for troubleshooting:
https://help.yahoo.com/kb/new-mail/fix-problems-mail-sln28075.html?impressions=true
Thank you!
Mail Support
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[Deleted User] commented
Oh and fix the link for U.S. Use browser shortcut icon and ended up on Yahoo Australia. Same when I type www.yahoo.com in browser search box.