One Signal Push Notifications

Ok, you’re using the correct one. Sorry about that.

OneSignal Push Notifications (by Two Bits) is for the SuperView web wrapper so don’t use that one.

OneSignal - Push Notifications (by OneSignal) is the one which integrates with Bubble and you have to follow the steps mentioned in this post:
https://manual.bubble.io/bubble-made-plugins/onesignal-web-notifications.html

More info here can be seen here:

Have you seen tis post?