diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ccad2aca2..176f6a069c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,9 @@
   * Initial release.
 * AzureBillingAccountsRoleAssignment
   * Initial release.
+* EXOArcConfig
+  * Fixed `Test-TargetResource` to correctly check property `ArcTrustedSealers`
+    when it has an array
 * EXOMailboxAuditBypassAssociation
   * Initial release.
 * EXOTenantAllowBlockListItems
diff --git a/Modules/Microsoft365DSC/DSCResources/MSFT_EXOArcConfig/MSFT_EXOArcConfig.psm1 b/Modules/Microsoft365DSC/DSCResources/MSFT_EXOArcConfig/MSFT_EXOArcConfig.psm1
index 3da9fdc728..a79d3e4da8 100644
--- a/Modules/Microsoft365DSC/DSCResources/MSFT_EXOArcConfig/MSFT_EXOArcConfig.psm1
+++ b/Modules/Microsoft365DSC/DSCResources/MSFT_EXOArcConfig/MSFT_EXOArcConfig.psm1
@@ -256,15 +256,17 @@ function Test-TargetResource
     Write-Verbose -Message 'Testing configuration of Arc Config settings'
 
     $CurrentValues = Get-TargetResource @PSBoundParameters
+    $ValuesToCheck = ([Hashtable]$PSBoundParameters).Clone()
 
-    Write-Verbose -Message "Current Values: $(Convert-M365DscHashtableToString -Hashtable $CurrentValues)"
-    Write-Verbose -Message "Target Values: $(Convert-M365DscHashtableToString -Hashtable $PSBoundParameters)"
-
-    $ValuesToCheck = $PSBoundParameters
-
+    $ValuesToCheck = Remove-M365DSCAuthenticationParameter -BoundParameters $ValuesToCheck
     # Need to remove Identity as Get-ArcConfig doesn't return Identity
     $ValuesToCheck.Remove('Identity') | Out-Null
 
+    $PSBoundParameters.ArcTrustedSealers = $PSBoundParameters.ArcTrustedSealers -Join ','
+
+    Write-Verbose -Message "Current Values: $(Convert-M365DscHashtableToString -Hashtable $CurrentValues)"
+    Write-Verbose -Message "Target Values: $(Convert-M365DscHashtableToString -Hashtable $PSBoundParameters)"
+
     $TestResult = Test-M365DSCParameterState -CurrentValues $CurrentValues `
         -Source $($MyInvocation.MyCommand.Source) `
         -DesiredValues $PSBoundParameters `