Powershell DB backup script pass only when executing from ISE - sql-server

Question

I've been using following backup script for a while to create .bacpac files for MSSQL databases. The script working ok in general but fails for some databases. Those databases are not too much different to others, maybe a bit bigger. As this is used only for dev databases the average size is not big, the bacpac file size is ~200Mb.
The weird thing the script successfully running when executed from PowerShell ISE but failed when running from the command line. Please note that script only failing for some databases and work for others. The error message is not really helpful:
WARNING: Exception occurred: Exception calling "ExportBacpac" with "2" argument(s): "Could not export schema and data from database."
We using MSSQL 2104 and the database can be exported to backup from MSSQL Studio without problems.
The script:
Param(
# Database name to backup e.g 'MYDB'
$databaseName,
# Database connection string "server=server ip;Integrated Security = True;User ID=user;Password=pass"
$connectionString,
# Path to the directory where backup file should be created
$backupDirectory
)
add-type -path "C:\Program Files (x86)\Microsoft SQL Server\120\DAC\bin\Microsoft.SqlServer.Dac.dll";
try {
$dacService = new-object Microsoft.SqlServer.Dac.DacServices $connectionString
# build backup filename
$backupFileName = $backupDirectory+"\"+$dataBaseName+[DateTime]::Now.ToString("yyyyMMdd-HHmmss")+".bacpac"
# perform backup
$dacService.exportBacpac($backupFileName, $dataBaseName);
Write-Output "Database backup file created $backupFileName"
} catch {
Write-warning "Exception occurred: $_"
throw "Database backup haven't been created, execution aborted."
}
Does anyone come across this issue? I know PowerShell and PowerShell ISE a bit different but I don't understand why script execution produces different results.
[EDIT]
Tried to add event listener for DacService and print output to get more debug information
register-objectevent -in $dacService -eventname Message -source "msg" -action { out-host -in $Event.SourceArgs[1].Message.Message } | Out-Null
The output is
Dac Assembly loaded.
Extracting schema (Start)
Gathering database options
Gathering users
WARNING: Exception occurred: Exception calling "ExportBacpac" with "2" argument(s): "Could not export schema and data
from database."
Gathering roles
Gathering application roles
Gathering role memberships
Gathering filegroups
Gathering full-text catalogs
Gathering assemblies
Gathering certificates
....
Processing Table '[dbo].[file_storage_entity]'. 99.74 % done.
Processing Table '[dbo].[file_storage_entity]'. 100.00 % done.
Exporting data (Failed)
[EDIT 2]
As a workaround, I've created C# program to do the same. Runs fine in any environment. The code virtually the same as in PowerShell script.