Amazon Chime can't schedule your meeting because there are more than 300 email addresses in the To: and CC: fields of your meeting invite.
asked
Can I still have an Amazon Chime meeting if I get a failure email?
Yes, you can still use the Amazon Chime bridge for your meeting.
The failure is that there will be no auto-call. Users can still join the meeting at the scheduled time. They will need to join manually by clicking on the link or choosing Meetings > Join a meeting and entering the meeting ID and the system will not know what the name of the meeting is or when it is scheduled to end.
If you want attendees to receive an auto-call - make sure there are <300 emails in the invite and send the update to all (not just the changed users).
There is more information about scheduling failure emails in this Q&A: https://answers.chime.aws/questions/142/why-was-i-sent-a-schedule-email-failure-email.html.
Documentation
View the Amazon Chime User, Administration Guide and API Reference on the AWS Documentation site.
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