Post your config for the message and we can work from there. See below for how to post your config and preserve the formatting. YAML is very sensitive to formatting so it helps to post is properly so the users here can check it.
HA doesn’t really do much until you start adding components and sensors and writing automation to work with those components and sensors. Its extremely powerful once you get rolling but the first steps can be hard. Lets get your messaging example working and you can see how it all works.
Ok, not sure if your notify competent is setup correctly as alot of it is missing (for obvious reasons) but the below config for your automation should work.
automation:
- alias: Send message at a given time
trigger:
platform: time
after: '16:35:00'
action:
service: notify.notifier_name
data:
message: Test Email
Two fixes. The time trigger was the incorrect version. The version you uses tries to match the time every hour so the hour:16 cannot be used. The time triggers are documented here:
Second was just some alignment of the data: item. It needed to be in line with the service item.
Yes it can be tested in the services tab. I don’t recall the formatting though for adding the message. Its in JSON and Im not very good at getting that right. Ill try tonight to get a working sample if no one chimes in sooner.