Notifications not working

Hi Dudes. So I have an ionic messenging app and it has notifications set up. However this doesn’t work for my Huawei android 10 phone. It is working on some other devices. Is there a fix to ensure it will work on every type of device/os?

Another bug is that I’m able to set different backgrounds for the messege screens. However, instead of keeping the background fixed size, as the messeges get longer the background image stretches. Is there also a universal fix for this?

Peace :v: