Thank you for your post.
I get then a error message
error loading /config/configuration.yaml: while parsing a block mapping
in "/config/automations.yaml", line 218, column 7
expected <block end>, but found '<scalar>'
in "/config/automations.yaml", line 218, column 28
The second automation will trigger when the group’s state changes to on. That means all the binary_sensors within the group were off and then one of them changed to on.
If a second binary_sensor in the group now changes to on, the automation will not be triggered again. Why not? Because the group’s was already on and simply remains on. There’s no state-change so there’s no trigger. In other words, there are situations where it will not send a notification.
You’re better served by the first automation that monitors each binary_sensor individually.