Get-MgUserCalendarView : Access is denied.

[R00tRx (itwguthub)]

Im trying to create a Daily update for all staff on their calendar entries which then will get sent to all management members.
In theory the script should loop through each user, view their daily entries and then open outlook and send me the updates.
But I keep getting these errors..
Get-MgUserCalendarView : Access is denied. Check credentials and try again.

I tried changing to "Users.ReadAll" , and pretty much all the rest as well

Connect-MgGraph -Scopes "Calendars.Read"

$timeZone = [System.TimeZoneInfo]::FindSystemTimeZoneById("New Zealand Standard Time")

$startDate = [System.TimeZoneInfo]::ConvertTimeBySystemTimeZoneId((Get-Date), $timeZone.Id).Date
$endDate = $startDate.AddDays(1)

$users = Get-MgUser -Filter "accountEnabled eq true" -All

$emailBody = ""

foreach ($user in $users) {
$userId = $user.Id
$calendarEntries = Get-MgUserCalendarView -UserId $userId -StartDateTime $startDate -EndDateTime $endDate

if ($calendarEntries) {
    $emailBody += "Calendar Entries for $($user.UserPrincipalName):`n"

    foreach ($entry in $calendarEntries) {
        $emailBody += "`t- Subject: $($entry.Subject)`n"
    }

    $emailBody += "`n"
}

}

if ($emailBody) {
Write-Output "Email body constructed successfully"
Write-Output $emailBody

$Outlook = New-Object -ComObject Outlook.Application
$Mail = $Outlook.CreateItem(0)
$Mail.Subject = "Today's Calendar Entries"
$Mail.Body = $emailBody
$Mail.Display()

} else {
Write-Output "No calendar entries found for any user"
}

Disconnect-MgGraph