Powershell pass variable into array

Question

I have a Powershell script that looks for files created in the past 24 hours in a certain folder and then looks for certain filenames which it then outputs to a folder. I would like to output to a hipchat room instead but I'm having trouble passing the variable. My code is below:

$var1 = Get-ChildItem -Path "W:\Blabla" -Recurse | Where-Object { $_.CreationTime -gt (Get-Date).AddHours(-24) } | Select-Object Fullname,CreationTime
Out-File test-24.txt -InputObject $var1

$var2 = Select-String -Path test-24.txt -Pattern "pass|Angie" | select line
Out-File test-out.txt -InputObject $var2



$params = @{
    Uri = "https://hipchat.blabla.com/v2/room/456/notification?auth_token=????"
    Method = "POST"
    Body = @{
        color = 'red'
        message = "$var2"
        notify = $false
        message_format = "text"
    } | ConvertTo-Json
    ContentType = 'application/json'
}

Invoke-RestMethod @params

I'm trying to pass $var2 into the second array but my messages turn out blank. Thank you.