Notification content extension not working

Are there some requirements to use Notification Content Extensions other than including the target to my iOS app?

I have done it, configured it to match a certain category of notifications, but my custom interface doesn’t show up.

is there anything I need to configure on my main app? Is that anything that should be changed there, such as disabking its botifications handling?

is there any requirement concerning the payload? I tried to disable time sensitive and content-available notifications, but it didn’t help.

Notification content extension not working
 
 
Q