diff --git a/eng/Version.Details.props b/eng/Version.Details.props
index 60b2f2d0f9..04ddb8791c 100644
--- a/eng/Version.Details.props
+++ b/eng/Version.Details.props
@@ -6,7 +6,7 @@ This file should be imported by eng/Versions.props
 <Project>
   <PropertyGroup>
     <!-- dotnet-dotnet dependencies -->
-    <MicrosoftDotNetArcadeSdkPackageVersion>10.0.0-beta.26412.103</MicrosoftDotNetArcadeSdkPackageVersion>
+    <MicrosoftDotNetArcadeSdkPackageVersion>10.0.0-beta.26418.103</MicrosoftDotNetArcadeSdkPackageVersion>
   </PropertyGroup>
   <!--Property group for alternate package version names-->
   <PropertyGroup>
diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index d507facdd3..da3bc65552 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
-  <Source Uri="https://github.com/dotnet/dotnet" Mapping="command-line-api" Sha="493580a515a01970cfe1da2c7dd589efbaf36996" BarId="326844" />
+  <Source Uri="https://github.com/dotnet/dotnet" Mapping="command-line-api" Sha="d247057ae32ae36e14905eb8e776304a84433554" BarId="327605" />
   <ProductDependencies>
   </ProductDependencies>
   <ToolsetDependencies>
-    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="10.0.0-beta.26412.103">
+    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="10.0.0-beta.26418.103">
       <Uri>https://github.com/dotnet/dotnet</Uri>
-      <Sha>493580a515a01970cfe1da2c7dd589efbaf36996</Sha>
+      <Sha>d247057ae32ae36e14905eb8e776304a84433554</Sha>
     </Dependency>
   </ToolsetDependencies>
 </Dependencies>
diff --git a/eng/common/Get-GitHubAppToken.ps1 b/eng/common/Get-GitHubAppToken.ps1
index 6b5899d7a2..9c7e3dcd6a 100644
--- a/eng/common/Get-GitHubAppToken.ps1
+++ b/eng/common/Get-GitHubAppToken.ps1
@@ -113,10 +113,13 @@ 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)
@@ -125,12 +128,19 @@ 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 `
diff --git a/global.json b/global.json
index 4f97a64339..04cd36a173 100644
--- a/global.json
+++ b/global.json
@@ -8,7 +8,7 @@
     }
   },
   "msbuild-sdks": {
-    "Microsoft.DotNet.Arcade.Sdk": "10.0.0-beta.26412.103"
+    "Microsoft.DotNet.Arcade.Sdk": "10.0.0-beta.26418.103"
   },
   "sdk": {
     "version": "10.0.111"