Not receiving app notifications on my iPhone 13 mini

Do you have a focus mode activated on the phone? This can cause notifications not to display if one is activated and not set up properly.

Something else to try is toggling the notification settings off and on again per app in the settings app.

If these quick fixes don’t seem to work, and it’s definitely more of a last resort, but you may have to consider performing a restore on the phone.

There are two ways to do this, with and without needing to connect to a computer. The best way is connecting to a computer as this will ensure you get a fresh install on the phone.

This guide will help you through the restore process if you have never had to do it before. How to factory reset your iPhone, iPad or iPod touch – Apple Support (UK)

Good luck, and I hope you manage to resolve your issue.

Have you restarted your device since you performed the update?

You can find instructions on how to do that here if you are unsure: Force restart iPhone – Apple Support (UK)

This is my first port of call to clear up any minor issues.