Add SQL Datasource via PowerShell not working in 14.1.1.0

I'm currently migrating our SQL Server where the RDM databases reside.
In the past we manually setup the datasources with .rdd files on the users computers.

To avoid manual reconfiguration of all clients i've created a powershell script to look for the used server in all configured datasources
and if there is one present with the old server this connection is deleted and recreated with the new server.

This works fine on my Workstation with RDM Version 2020.1.20.0 - but on my testdevice which has the same version as all other clients (14.1.1.0) it's not working.

i tried to manually add a datasource via PS but without success -i'll get the response below but when i run Get-RDMDatasource it's still not present.

New-RDMDataSource -SQLServer -Database DATABASE -IntegratedSecurity -server Server -Name PSTest -setdatasource

Also deleting a manually added datasource via PS is not working - thats the reason why me script is not working - Am i missing something here?

Here the script :

Import-Module RemoteDesktopManager.PowerShellModule

$SQLServer='NewSQLServersHostname'
$OldSQLServer='OldSQLServersHostname'
$AutoGoOffline='True'
$PromptOfflineMode='False'
$Timeout='30'
$CommandTimeout='60'
$CurrentDatasources = get-RDMDatasource


foreach ($Datasource in $CurrentDatasources) {
    $CurrentSQLServer = Get-RDMDatasourceProperty -DataSource $Datasource -Property Server
    $Database = Get-RDMDatasourceProperty -DataSource $Datasource -Property Database
    if($CurrentSQLServer -eq $OldSQLServer){
        Remove-RDMDataSource -DataSource $DataSource
        $DS = New-RDMDataSource -SQLServer -Database $Database -IntegratedSecurity -Server $SQLServer -Name $Database -SetDataSource
        Set-RDMDatasourceProperty -DataSource $DS -Property AutoGoOffline -Value $AutoGoOffline
        Set-RDMDatasourceProperty -DataSource $DS -Property CommandTimeout -Value $CommandTimeout
        Set-RDMDatasourceProperty -DataSource $DS -Property Timeout -Value $Timeout
        Set-RDMDatasourceProperty -DataSource $DS -Property PromptForOfflineMode -Value $PromptOfflineMode
        Set-RDMDataSource -DataSource $DS
    }
}