Alerts sometimes do not work on the phone?

Ex
- in Mate series
2

I've been using the Huawei Mate 20 for about a month and from the beginning it was the case that apps do not work for many apps.
They work on WhatsApp, Snapchat, Instagram, and Email, but for all others, they either do not work at all or only occasionally. For example, they do not work on my Spiegel Online app and that's really stupid because I can't hear so many messages.

Gu

It may be that you have to set a notification permission for certain apps in the settings

Ex

I've already looked. That is already activated

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