Attendee List Disappeared When Scheduling Meetings

I used to be able to type in the attendee’s emails when schedule a meeting and after I confirm google calendar will automatically send out emails to them like in the first picture. But now that option disappeared. Anybody know why and how I can get it back?

Hi @zhenqi
Thanks for reaching out to us and welcome to our community!
Can you please share with me what endpoints are you using to achieve this behavior and if you are using our APIs to accomplish that?