Background app refresh and notifications not working on my iPhone 13 Pro

Hello.

somehow all my apps don’t refresh in background and I don’t get notifications either. It’s the issue for all apps.

i tried, restart my phone, reset all settings, checked screen time setting, checked background app refresh setting including notifications for individual apps, also battery settings is not on low power mode, I don’t have any focus mode set now

but still can’t get apps to background refresh or get notifications, apps only refresh when I open them.

iOS version is 18.2, iPhone 13 Pro.

can someone help please?

[Re-Titled by Moderator]