Difference between Scheduling Privileges, Alternative Host and Co-Hosts

Co-Hosts

Allows someone else to manage the administrative side of the meeting, such as muting participants or starting/stopping the recording.

Co-hosts should be assigned during the meeting.
There is no limitation on the number of co-hosts you can have in a meeting.
Co-host will automatically be the host if the host gets disconnected.

Co-hosts do not have access to the following controls as they are only available as host controls in a meeting:

Start closed captioning and assign someone or a third-party to provide closed captioning
Start live streaming
End meeting for all participants
Make another participant a co-host
Start breakout rooms or move participants from one breakout room to another
Start waiting room (co-hosts can place participants in waiting room or admit/remove participants from the waiting room)

Co-hosts also cannot start a meeting. If a host needs someone else to be able to start the meeting, they can assign an alternative host.

Alternative host

Allows you to schedule meetings and designate another NUS Zoom Licensed user to start the meeting if Host who schedules is not able to start the meeting.

There is no need to schedule someone who will be Co-Host as Alternative Host. Make them co-hosts in the meeting itself.
The meeting will still belong under the Host who schedules account.
You will not be able to start another concurrent meeting, since Zoom allows each account to only start one meeting at a time.
Alternative Host will need to have an NUS Zoom Licensed account. Not for external or Basic account.
Alternative Host will receive an email notifying them that they've been added as an Alternative Host, with a link to start the meeting.
Alternative Host will need to use the Start Meeting button/link in the email.
If they cannot find it in the mailbox, search for "invites you to join a Zoom meeting as alternative host" in inbox.
Alternative Host does not have access to Polling feature.

Scheduling privilege

Designed to be used when someone else will do the scheduling; like an Executive Admin, Event Scheduler or Secretarial Duties:

The Meeting HOST should first assign or grant Scheduler permission to schedule meetings.
Scheduler to create new meeting on behalf of Meeting HOST.
The Meeting HOST will not have access to Polling feature.
How to use scheduling privileges

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FAQ

Can Alternative Host start Breakout Room?
If Alternative Host is the HOST of the session, the HOST of the session can start Breakout Room.
Can Alternative Host Enable/Disable Waiting Room, Make Co-Host, Edit Chat Settings...
If Alternative Host is the HOST of the session, the HOST of the session have access to all controls except for Polling.
Can Alternative Host launch a Poll?
No one else can launch a poll except for the Host who schedule.

More on:
Alternative Host
Scheduling Privilege
Co-Host