Vivo device

Find "Forex alarm app" then turn on it as instruction form Vivo global support site: https://www.vivo.com/en/support/questionByTitle?title=How%20to%20turn%20on/off%20Autostart%20for%20my%20apps?

How to turn on/off Autostart for my apps?

You can go to Settings>More settings>Permission management(Applications)>Autostart to turn on/off the app switch.

For Funtouch OS 2.6 and lower version: Go to i Manager>App manager>Autostart manager to turn on/off the app switch.

Warmly Tips: The Autostart of some built-in apps is turned on by default