powershell - test-path not working when in a scheduled task -

i have script return list of database backup files on number of remote database servers.

i use test-path check if unc path exists, if exists returns list of files using get-childitem.

when test script test-path works @ command prompt when run script in scheduled task returns false.

i have tried number of different ways use test-path none of them work. script runs under same account @ command prompt , schedule task.

the schedule task runs highest privileges , whether user logged on or not.

the script located on script server , called via unc, tested way @ command prompt , in scheduled task on mssql database server.

if(test-path -path "filesystem::$targetuncfolder") {     ... } 

and

$localuncfolderexists = test-path -path $targetuncfolder if($localuncfolderexists -eq $true) {     ... } 

and

if($(try {test-path -path $targetuncfolder} catch {$false})) {     ... } 

if bypass test-path , allow drop get-childitem, returns number of items correctly foreach not iterate through list returned get-childitem, again if ran in scheduled task

# add underscore current database name $databasename = "$dbname" + "_"  # files <database name> followed underscore $localfiles = gci $targetuncfolder -include $databasename* -recurse -file | sort creationtime -descending  | select fullname, name, directory, extension, length, lastwritetime  # number of files $filesonlocalserver = @($localfiles).count;  # log number of files, using custom log function log-output($logfile) ("number of files on server: $filesonlocalserver");  # loop through files foreach($backupfile in $localfiles) {     ... } 

nothing else in script fails when called scheduled task, reading files file-system.

edit question: code relevant parts

  #for each server instance in list, check , gather server, instancce , database data     foreach ($row in $datasetserverlist.tables[0].rows) {           # ...         $servername = $($row[1]).trim()    # current server's name         ...         $instancename = $($row[3]).trim()  # current instances's name      # ... scan server      $targetuncfolder = "\\$servername\backupsfull$\$instancename\"     ($i=0;$i -lt $datasetserverdatabases.tables.count;$i++){         foreach($database in $datasetserverdatabases.tables[$i].rows) {               #...             $dbname  = $($database[0])              # ...              # check the unc path exists             # *** returns false when ran in scheduled task             if(test-path -path "filesystem::$targetuncfolder") {                  # add underscore current database name                 $databasename = "$dbname" + "_"                  # files <database name> followed underscore                 # *** doesn't return list of files when ran in scheduled task                 $localfiles = gci $targetuncfolder -include $databasename* -recurse -file | sort creationtime -descending  | select fullname, name, directory, extension, length, lastwritetime                  # number of files                 $filesonlocalserver = @($localfiles).count;                  # log number of files, using custom log function                 log-output($logfile) ("number of files on server: $filesonlocalserver");                  # loop through files                 foreach($backupfile in $localfiles) {                     # ...                  }                                }         }     } } 

to working had use local path, not unc path script, don't know why fails when called via unc, test-path , gci cmdlet