Service bus queue message Content convert to string with PowerShell - powershell

Question

I use rest api with powershell to get details from the Service Bus queue message. I am not sure when it happened, but now Content is in bytes ex: Content:{64, 6, 115, 116…}.
How can I convert it to the normal string with data?
function Get-SAStoken {
param (
$QueueName,
$Access_Policy_Name,
$Access_Policy_Key
)
$expireInSeconds = 300
[Reflection.Assembly]::LoadWithPartialName("System.Web")| out-null
$uri="my.servicebus.windows.net/$QueueName"
#Token expires now+300
$expires=([DateTimeOffset]::Now.ToUnixTimeSeconds())+ $expireInSeconds
$signatureString=[System.Web.HttpUtility]::UrlEncode($uri)+ "`n" + [string]$expires
$HMAC = New-Object System.Security.Cryptography.HMACSHA256
$HMAC.key = [Text.Encoding]::ASCII.GetBytes($Access_Policy_Key)
$signature = $HMAC.ComputeHash([Text.Encoding]::ASCII.GetBytes($signatureString))
$signature = [Convert]::ToBase64String($signature)
$sasToken = "SharedAccessSignature sr={0}&sig={1}&se={2}&skn={3}" -f [System.Web.HttpUtility]::UrlEncode($uri),
[System.Web.HttpUtility]::UrlEncode($signature),
[System.Web.HttpUtility]::UrlEncode($expires),
[System.Web.HttpUtility]::UrlEncode($Access_Policy_Name)
return $sasToken
}
function Get-SBmessage {
param (
$SASToken,
$Queue
)
$queue = $Queue
$header = #{ Authorization = $SASToken }
$postService = Invoke-WebRequest -Uri "https://my.servicebus.windows.net/$queue/messages/head" `
-Headers $header `
-Method Post
return $postService
}
$Queue = "capacity-checker"
$SAStokenRunningTest = Get-SAStoken -QueueName $Queue -Access_Policy_Name "pipeline" -Access_Policy_Key "key-for-sb-queue"
$SBmessage = Get-SBmessage -SASToken $SAStokenRunningTest -Queue $Queue
$SBmessage

Answer 1

So my solution is
[byte[]]$bytes = $SBmessage.Content
$msContent = [System.Text.Encoding]::ASCII.GetString($bytes)
Thanks, #MathiasR.Jessen for the help