Assign Calendar Privileges with Powershell

Im trying to assign Calendar Permissions to Owner and Member, Owner should have read&write while members only read.

This is the code i came up with. the error i got was the following:

Specified method is not supported.

Status: 400 (BadRequest)

ErrorCode: ErrorNotSupported

Thank you for your help

$groupId
$calendarId
$owners
$members
foreach
$ownerId
New-MgUserCalendarPermission
}
foreach
$memberId
New-MgUserCalendarPermission
}