How to get rid of notifications?

Moin friends, I recently bought the Pokeball Plus. Now the thing is that it shows me all the time that I'm not connected (even when I'm). How can I get rid of this popup notification? My Huawei P20 Lite only jerks. The message pops up every second and disappears for another second.

I ask for urgent help.

Can't you manage the permissions for each app in the mobile phone settings?

I tried that, but only the normal notifications that you get in the top bar are blocked there

OK. Have you ever checked the app's settings to see if you can turn it on?

Connecting to the pokeball is not a problem. The problem is that annoying constant popping notification on the screen

I got that. I thought that you can turn off the notification in the settings of the app.