Background app refresh and notification issues on my iPhone 8

"Background app refresh and notification issues: Hello. All my apps aren’t refreshing in the background, and I’m not receiving any notifications from any of them. This issue affects all apps. The app only refresh when I open it[...]"

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Great job troubleshooting this, so far!

Troubleshooting App Refresh and Notification Issues:

A. Clear you Notification History:

1. Go here: Use notifications on your iPhone or iPad - Apple Support
2. Scroll to: Open from Notification Center
3. As it Reads: To clear your notification history, tap the Close button, then tap Clear

and...

B. Clear the Caches:

Clear the storage named "System Data" (formerly called "Other"). It basically contains unnecessary files such as caches that are used for system ease of use, app's remembrance of usage - all of which gather over time. And the iPhone just might have a few of these settings that need not be when they are. Here is how to rid of these: How to Clear "System Data" in your iPhone's Storage: - User Tips. Caches would be being used for remembrance of application use.