From 0760b561fecaf56748ae1a30c7b7ae3a6cd0a151 Mon Sep 17 00:00:00 2001
From: Missy Messa <mjanecke@microsoft.com>
Date: Tue, 11 Aug 2026 07:05:30 -0700
Subject: [PATCH] Fix OneLoc GitHub App installation selection

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: f12710df-91d5-49e4-b327-337932478b0b
---
 eng/common/Get-GitHubAppToken.ps1 | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/eng/common/Get-GitHubAppToken.ps1 b/eng/common/Get-GitHubAppToken.ps1
index 648035a3ecf..ded1a6595cc 100644
--- a/eng/common/Get-GitHubAppToken.ps1
+++ b/eng/common/Get-GitHubAppToken.ps1
@@ -104,10 +104,13 @@ try {
     $installations = @()
     $page = 1
     do {
-        $pageInstallations = @(Invoke-RestMethod `
+        # Assign the response before wrapping it in @(). PowerShell otherwise
+        # preserves a top-level JSON array as one nested pipeline object.
+        $pageResponse = Invoke-RestMethod `
             -Uri "https://api.github.com/app/installations?per_page=100&page=$page" `
             -Headers $headers `
-            -Method Get)
+            -Method Get
+        $pageInstallations = @($pageResponse)
         $installations += $pageInstallations
         $page++
     } while ($pageInstallations.Count -eq 100)
@@ -116,12 +119,19 @@ catch {
     Write-PipelineTelemetryError -Category 'Build' -Message "Failed to list GitHub App installations: $_. The signed JWT may be invalid or the App's Client ID ('$AppClientId') may be incorrect."
     exit 1
 }
-$installation = $installations | Where-Object { $_.account.login -ieq $InstallationOwner } | Select-Object -First 1
-if (-not $installation) {
+$matchingInstallations = @($installations | Where-Object { $_.account.login -ieq $InstallationOwner })
+if ($matchingInstallations.Count -eq 0) {
     $found = ($installations | ForEach-Object { $_.account.login }) -join ', '
     Write-PipelineTelemetryError -Category 'Build' -Message "No installation found for '$InstallationOwner'. App is installed on: $found"
     exit 1
 }
+if ($matchingInstallations.Count -ne 1) {
+    $matchingIds = ($matchingInstallations | ForEach-Object { $_.id }) -join ', '
+    Write-PipelineTelemetryError -Category 'Build' -Message "Found multiple installations for '$InstallationOwner': $matchingIds"
+    exit 1
+}
+$installation = $matchingInstallations[0]
+Write-Host "Using installation $($installation.id) for '$($installation.account.login)'."
 
 try {
     $tokenResponse = Invoke-RestMethod `