Yahoo Mail temporary error is a minor technical glitch that usually corrects itself after some time. However, you can also use the steps mentioned below to troubleshoot the issues:

•Sign out of your Yahoo account from your desktop and your mobile
•Ensure that you are using a supported browser to access Yahoo Mail
•Clear the cache and delete the cookies before you open Yahoo
•Restart your browser and enter your Yahoo login details to check if the issue is resolved

If you find that the temporary error persists, you can call the Yahoo customer support number and speak to a professional email expert to resolve the issue. https://www.email-helps.com/