Wait for remote Powershell script to finish - powershell

Question

I'm creating a powershell script to import Dynamics NAV Application Objects to my Dynamics NAV 2018 database.
Microsoft is providing a PS cmdlet - Import-NAVApplicationObjects - to do so, but I have trouble to wait for the command to finish.
I have a calling script which does the following
$PSSession = New-PSSession -ComputerName $TargetMachine -Credential $MyCredential
Invoke-Command -Session $PSSession -ArgumentList $Database_Name_user, $MyCredential -ScriptBlock {
$process = Start-Process powershell.exe -Verb RunAs -Wait -PassThru -ArgumentList "-File `"C:\Users\User\Desktop\Database\Import1.ps1`" $args[0]"
$process.WaitForExit()
if ($process.ExitCode -ne 0) {
throw $process.StandardError.ReadToEnd()
}
}
The script Import1.ps1 on my $TargetMachine looks like this
param(
[String]$Database_Name_user
)
try {
$AllFiles = "C:\Users\User\Documents\AllFiles.txt"
$Modules = "C:\GIT\Loading Components\NAVModuleImport.ps1"
$OutputBuffer = import-module $Modules
Import-NAVApplicationObject -Path $AllFiles -DatabaseServer "SQLSRV001" -DatabaseName $Database_Name_user -SynchronizeSchemaChanges "No" -ImportAction "Overwrite" -Confirm:$false | Out-Null
}
catch{
$_ | Out-File "C:\Users\User\Documents\Import1.txt"
}
The file AllFiles.txt has a size of 220 MB and contains more than 7700 Dynamics NAV Application Objects (tables, pages, codeunits and so on).
When I launch the script which executes Import-NAVApplicationObject directly from the remote computer stored in $TargetMachine everything works smootly and the process takes up to 10 to 15 minutes, as expected.
When calling the script as shown in the first code example the output stops for a minute and then says everything is done.
Any help is appreciated, thank you in advance.
Edit: Solution
I noticed that my scripts as shown are working, the Import-NAVApplicationObjects cmdlet just failed.
When I elevate the powershell process on the remote computer and run the import, the cmdlet tried to authenticate as NT-Authority\Anonymous to the database.
Then I passed the credentials of the user that opens the remote PSSession to Import1.ps1 and used the parameters -UserName and -Password of the import cmdlet.
Sadly this process failed again.
Now I tried some things with the user I want to use for authenticating, changing passwords etc and it worked! The password contained a semicolon ; and apparently the import cmdlet was not happy with that.
So my simple solution is: Removing the semicolon from the password.