Require a Host start a meeting

[influential]

Some of the meetings I scheduled for another full license user in Calender with add-on will require the host to start ( then stay in there for the whole meeting). In the setting, I have that the Paticpaints can join before the host, and the waiting room disable in both accounts and The meetings are not personal rooms (mine or the person I scheduled for).

It doesn't always happen

What can I do or check to ensure the host is not required to start the meeting?