Why doesn't the information sent by the indicator light in the upper right corner of vivo mobile phone flash?

Vivo mobile phone indicator flashes, and the following conditions must be met:

First, whether the mobile phone supports the indicator light;

2. Enter Settings-More Settings-Indicator, and turn on the related indicator function switch;

Specific operation (taking vivo X20 mobile phone as an example):

1, standby desktop entry setting

2, more settings

3. Indicator light

4. Turn on the relevant function switch (for example, the green light flashes when there is a notice).

Third, there are unread notices/messages or missed calls;

Fourth, the mobile phone is in a locked screen state.

Fifth, restart the phone.