Convert CSV to XLSX via PowerShell not working with Task scheduler

Hi, I tried to using this csv to Excel convert in one of storage Capacity reporting script. In script the storage cmd will run and generate a CSV data and I tried to put it as source for this script. It is working successfully when I manually running it. But the xlsx file is not generating when I putting this in a Windows task scheduler and running it , but storage cmd and csv file generation is happening. Could you someone help me on where is wrong. I am confused.

Thanks in advance.

Below is the script:-

$csv = "D:\Temp\UnityScript\Logs\FS_UTIL" +".csv" #Location of the source file

$xlsx = "D:\Temp\UnityScript\Logs\FS_UTIL1" +".xlsx" #Desired location of output

$delimiter = "," #Specify the delimiter used in the file

Remove-Item $csv

Remove-Item $xlsx

#EMC Storage cmd which give CSV output

uemcli -d X.X.X.X -u XXX -p XXX  /stor/prov/fs show -output csv -filter "Name,Health details" >> $csv

# Create a new Excel workbook with one empty sheet                                                                                                   

$excel = New-Object -ComObject excel.application                                    

$workbook = $excel.Workbooks.Add(1)                                                 

$worksheet = $workbook.worksheets.Item(1)                                            

# Build the QueryTables.Add command and reformat the data                           

$TxtConnector = ("TEXT;" + $csv)                                                  

$Connector = $worksheet.QueryTables.add($TxtConnector,$worksheet.Range("A1"))       

$query = $worksheet.QueryTables.item($Connector.name)                               

$query.TextFileOtherDelimiter = $delimiter                                          

$query.TextFileParseType  = 1                                                       

$query.TextFileColumnDataTypes = ,1 * $worksheet.Cells.Columns.Count                

$query.AdjustColumnWidth = 1                                                        

# Execute & delete the import query                                                  

$query.Refresh()                                                                    

$query.Delete()                                                                     

# Save & close the Workbook as XLSX.                                                

$Workbook.SaveAs($xlsx,51)                                                       

$excel.Quit()