Get-AVDUnavailableToTeams.ps1

$PoolStatus = Get-AzWvdSessionHost -HostPoolName $HostPool -ResourceGroupName $ResourceGroup
If ((($PoolStatus | Where { $_.Status -ne 'Available' }).Count -gt 1) -or (($PoolStatus | Where { -not $_.AllowNewSession }).Count -gt 1)) {
    # OK, more than 1 machine in the pool is either unavailable or not allowing new sessions
    
    $Summary = "Unhealthy WVD pool members"
    $InitialDescription = "It appears that not all machines are as they should be. Please investigate"
    $InitialDescription += $PoolStatus | Select name , status , lastupdatetime, allownewsession | ft -auto | Out-String

    $TeamsID = "https://yourteamswebhooketcetc.webhook.uks.azure-automation.net/webhooks?token=xxxyyy"
    Send-TeamsMessage {
        New-TeamsSection -ActivityTitle $Summary -ActivitySubtitle "All done" `
            -ActivityImageLink "https://somewhere/warning.png" `
            -ActivityText $InitialDescription | Out-String
    } -Uri $TeamsID -Color DarkSeaGreen -MessageSummary 'none'
}