Updating Escalation Chains via REST

I am attempting to adjust an escalation chain via PowerShell and REST. I am currently getting back a 1007 and can't seem to figure out what is wrong. Below is what I am using, I have tried different forms of $data. Our main goal is to change CC.

We have tried these two and then the 1 in the script below. Just not sure what is coming up wrong.

$data = '"ccDestinations":[{"type":"arbitrary","method":"email","addr":"test@test.com"}]'

$data = '"destinations":[{"type":"single","stages":[[{"type":"arbitrary","method":"email","addr":"test@test.com"}]]}]'

 

<# Use TLS 1.2 #>
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

<# account info #>
$accessId = ''
$accessKey = ''
$company = ''

<# request details #>
$httpVerb = 'PUT'
$resourcePath = '/setting/alert/chains/4'
$data = '"name":"Chain 1","ccDestinations":[{"type":"arbitrary","method":"email","addr":"fakeemail@email.com"}],"destinations":[{"type":"single","stages":[[{"type":"arbitrary","method":"email","addr":"anotherfakeemail@email.com"}]]}]'


<# Construct URL #>
$url = 'https://' + $company + '.logicmonitor.com/santaba/rest' + $resourcePath

<# Get current time in milliseconds #>
$epoch = [Math]::Round((New-TimeSpan -start (Get-Date -Date "1/1/1970") -end (Get-Date).ToUniversalTime()).TotalMilliseconds)

<# Concatenate Request Details #>
$requestVars = $httpVerb + $epoch + $data + $resourcePath

<# Construct Signature #>
$hmac = New-Object System.Security.Cryptography.HMACSHA256
$hmac.Key = [Text.Encoding]::UTF8.GetBytes($accessKey)
$signatureBytes = $hmac.ComputeHash([Text.Encoding]::UTF8.GetBytes($requestVars))
$signatureHex = [System.BitConverter]::ToString($signatureBytes) -replace '-'
$signature = [System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes($signatureHex.ToLower()))

<# Construct Headers #>
$auth = 'LMv1 ' + $accessId + ':' + $signature + ':' + $epoch
$headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"
$headers.Add("Authorization",$auth)
$headers.Add("Content-Type",'application/json')

<# Make Request #>
$response = Invoke-RestMethod -Uri $url -Method $httpVerb -Body $data -Header $headers 

<# Print status and body of response #>
$status = $response.status
$status
$body = $response.data | ConvertTo-Json -Depth 5
$body