Fake calls not working with screen off

[gmm96]

So that's it, I schedule a call in 10 seconds (i.e.) and turn off the screen. After 10 seconds, nothing happens. When screen is on, fake call works like a charm.

I gave app all permisssions and avoided battery restrictions, but doesn't solve it.

Phone: One Plus 10T 5G
Android: 15

Greetings.