Push notifications from one signal do not work

Hello, I’m trying to send push notifications from one signal, but it doesn’t work. Use what they indicate in this video: https://www.youtube.com/watch?v=AfixF7izuSs&t=423s

please help me

welcome back
if you search the community then you will find out, that this is and old issue…
for a working solution you can try

Taifun