With astonishing features, amazing updates, and a user-friendly interface, it has created a unique fan base. However, the user does encounter technical problems like Yahoo Mail not syncing or not working. Now, in such a situation, you must clear your browser's cache, disable browser enhancements, and disable antivirus, antispyware, or firewall products. You can try to open your Yahoo Mail Account in a different system or browser. By doing so, you can troubleshoot your problem easily.

Read the blogs-
https://www.contactyahoo.us/blog/yahoo-mail-not-working-on-iphone/
https://www.gethumanhelp.com/why-is-yahoo-mail-not-working/