There are three different auto-join options:
Auto-join all meetings with a web conference link:
Eric.ai will join all meetings in your calendar, whether you're the host or an invitee.
Automatically join only meetings I host:
Eric.ai will join meetings where you're the host. For meetings you're not hosting, you'll need to manually add Eric.ai if you want him to attend.
Do not auto-join:
Eric.ai will not join any meetings automatically. You'll need to manually invite Eric.ai to meetings you want recorded, transcribed and summarised. For more details, see the FAQ: 'How do I add Eric.ai to my meetings?'