I have successfully tested Push Notifications on iOS and it will be deployed to pixelfed.social later today
After you update the TestFlight version, navigate to your Settings and you will see a new Push Notifications button, tap that and enable them and each notification type
You will have you allow the app to send you notifications, and they will be limited to pixelfed.social for now, once we gather enough bug reports we will roll out general availability to other apps and servers
@dansup
Yay!