Remote Powershell cmdlet execution

Hi, I'm having issue trying to figure out how I can authenticate with the application using PS without interact with the login interface.

What I am trying to achieve is to delete inactive/deteled AD users from RDM database and this is part of our powershell leaver process.

What I have tried so far is below:

1)
Import-Module "${env:ProgramFiles(x86)}\Devolutions\Remote Desktop Manager\RemoteDesktopManager.PowerShellModule.psd1"

Get-RDMSession - (This prompts me the application login interface, insert admin username and password)

2)
Import-Module "${env:ProgramFiles(x86)}\Devolutions\Remote Desktop Manager\RemoteDesktopManager.PowerShellModule.psd1"
$pass = ConvertTo-SecureString "mypassword" -AsPlainText -Force

Set-RDMCurrentDataSource -ID x-x-x-x-x -Username Administrator -Password $pass
Update-RDMUI
Get-RDMSession


In second scenario after I have used Set-RDMCurrentDataSource and then perform Get-RDMSession the cmdlet returns nothing.
When I use : Get-RDMUser and it returns WARNING: Your connection is not ready

Thanks
Ket