Can I receive push notifications after a certain period of time?

[Kyochoul_Lee]

I want to set the time to receive push notifications.
For example
If there is an important appointment in 10 days. If I record this appointment and set it 10 days later, I get a push notification after 10 days.

At this time, the message is a message sent from the app.
And
This message should only be received by the app that sent the push notification message.

[Kyochoul_Lee]

I did block coding like the picture above.
However, I received the message shown below.
What is wrong?
Is there a way to get or receive the player id? (i.e. not looking at the webpage of onesignal)

[Peter (Moderator)]

You have to fill all the sockets in the block.

[Kyochoul_Lee]

Push notifications work because the socket is filled with empty text.
Thank you.

Is there any way to receive push notification after a certain period of time?