Hi,

I'm using Redmi Note 9S. I'm encounter issue after format my mobile.

The whatapps, telegram not show when phone lock mode.

It just flash only but did not show any message.

How to fix this?

Thanks,

as i know, most android phone on lock screen setting, will got option to show notification, show detail or just title,
check on 2 section of your phone, lock screen setting and notification setting

I already set those option, reboot and test.

But it's not appear on the screen. But when screen unlock, i can see those notification appear.

or check per app notification setting?

Attach below