There are different reasons why a user sees a display message 'Yahoo temporary error 19'. To resolve this issue manually, the concerned person can apply the steps that are shared below or get in direct reach with the executive at Yahoo phone number.
Run an antivirus scan in the system to browse for malware and virus and fix them
Enable the web browser to accept cookies
Change your internet connection or access Yahoo account from another device
Make sure that you are accessing Yahoo from a supported web browser and operating system
Also, protect your Wi-Fi connection with a password.