Notifications for some apps not working

I have an issue for about a month where certain apps are not sending notifications on my iphone but they always used to. I did not change my notification settings. I was hoping that maybe if I did an update to the system it would repair but still not. I used to get notifications and badges for signal, cbc news, algezera news, the weather network - but they have all stopped. And today my calendar notifications stopped. All notification settings are turned on in app and in system settings.

For signal I receive the notifications once I open the app but the rest- I just don’t get the notifications at all.

Can you advise how I can fix this?