Trying to hack SharePoint Online to Configure Site Collection Tenant default timezone (context here: https://twitter.com/cann0nf0dder/status/1260607421111767042)

TenantSiteCollectionDefaultTimeZone.ps1

# THIS IS NOT WORKING. It´s raising a Bad Request response, but it might be possible with more testing 
# and setting more Headers required by the API. 
# You can do the Update from Admin centre, and get the request is done by the Page using Browser dev tools

#FIRST do Connect-PnPOnline to your tenant admin URL...

$url = "https://tenant-admin.sharepoint.com/"
$endpoint = "https://tenant-admin.sharepoint.com/_api/SPOInternalUseOnly.TenantAdminSettings"

$webCtx = (Get-PnPWeb).Context
$authCookie = $webCtx.Credentials.GetAuthenticationCookie($url, $true)
$digest = $webCtx.GetFormDigestDirect().DigestValue

$session = New-Object Microsoft.PowerShell.Commands.WebRequestSession
$session.Cookies.SetCookies($url, $authCookie)
$session.Headers.Add("X-RequestDigest", $digest)

$itemPayload = @{"TenantDefaultTimeZoneId" = @{"Value" = 3}}

try { 
  Invoke-WebRequest -Uri $endpoint -Method PATCH -ContentType 'application/json; charset=utf-8' -WebSession $session -Body $itemPayload
} catch {
  $err=$_.Exception
}