Can I get a notification when Android locks the screen?

First of all, if you want to accept this message when the screen is locked, you must go to the network settings and open the network that has been connected.

Moreover, the mobile phone guarantees that it must be connected to the network at least in the case of wifi or mobile data.

Some software with its own control function must also be turned on.

In mobile phone control, the background also needs to be turned on, otherwise the screen will be locked, and the software will exit the background, that is, it will not be able to receive information.

Together, these can completely guarantee the reception in the locked screen state.