iOS notification not working

Very new to Home Assistant, so please bear with me. I have “default_config:” in the configuration.yaml file, and have notifications enabled. I tried every sample node red iOS notification example to no avail, and then discovered that I could test it with the developer-tools/service (thanks to the link). Nothing happens. Nothing notable shows up in log, where do I begin?

I am running
Home Assistant 2021.1.0
App Version 2021.1

I had to enable these two integrations to get the iOS notifications working:

# Enable IOS frontend

# Enable mobile_app

Both are placed in my configurations.yaml without any parameters.