[Connect-AzConnectedMachine] Fixes error with return value processing (Azure#19542)

* Fixing error with return value processing

* Update changelog

Author: nyanhp

src/ConnectedMachine/Changelog.md

@@ -24,6 +24,7 @@
 * Added cmdlet Update-AzConnectedMachine
 * Added ResourceGroup to the display table
 * Fixed the issue of extension settings not being able to serialize correctly
+* Fixed issue with Connect-AzConnectedMachine throwing errors when onboarding multiple machines at once
 
 ## Version 0.3.0
 * Upgraded API version to 2021-05-20

src/ConnectedMachine/custom/Connect-AzConnectedMachine.ps1

@@ -241,7 +241,7 @@ function Connect-AzConnectedMachine {
     # Handle show result by getting the name and getting the machine object
     $showResult | ForEach-Object {
         # Get name of machine registered
-        $selectStrResult = $ShowResult | Select-String -Pattern "^Resource Name\s+: (?<resourceName>.*)\n"
+        $selectStrResult = $_ | Select-String -Pattern "^Resource Name\s+: (?<resourceName>.*)\n"
         $Name = $selectStrResult.Matches.Groups |
             Where-Object Name -EQ resourceName |
             Select-Object -ExpandProperty Value