diff --git a/.editorconfig b/.editorconfig
index e8b23c3..9ec8c17 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -237,6 +237,7 @@ resharper_convert_to_primary_constructor_highlighting = none
 
 # Meziantou Rules
 dotnet_diagnostic.MA0003.severity = none
+dotnet_diagnostic.MA0038.severity = none
 
 #### Razor Files ####
 
diff --git a/src/Visus.AddressValidation.Integration.Google/Serialization/Json/ApiResponseJsonSerializerContext.cs b/src/Visus.AddressValidation.Integration.Google/Serialization/Json/ApiResponseJsonSerializerContext.cs
index 3b81f13..468b29f 100644
--- a/src/Visus.AddressValidation.Integration.Google/Serialization/Json/ApiResponseJsonSerializerContext.cs
+++ b/src/Visus.AddressValidation.Integration.Google/Serialization/Json/ApiResponseJsonSerializerContext.cs
@@ -8,4 +8,4 @@ namespace Visus.AddressValidation.Integration.Google.Serialization.Json;
 [JsonSerializable(typeof(ApiErrorResponse))]
 [JsonSerializable(typeof(ApiResponse))]
 [JsonSourceGenerationOptions(WriteIndented = false, PropertyNamingPolicy = JsonKnownNamingPolicy.CamelCase)]
-internal partial class ApiResponseJsonSerializerContext : JsonSerializerContext;
+internal sealed partial class ApiResponseJsonSerializerContext : JsonSerializerContext;
diff --git a/src/Visus.AddressValidation/Services/AbstractAuthenticationService.cs b/src/Visus.AddressValidation/Services/AbstractAuthenticationService.cs
index 27b3a9b..a078d50 100644
--- a/src/Visus.AddressValidation/Services/AbstractAuthenticationService.cs
+++ b/src/Visus.AddressValidation/Services/AbstractAuthenticationService.cs
@@ -99,7 +99,7 @@ public string? CacheKey
                                                         cancellationToken)
                                                    .ConfigureAwait(false);
 
-        if ( !factoryRan )
+        if ( !factoryRan ) // NOSONAR S2583 - false positive: factoryRan is mutated inside the async lambda above
         {
             return string.IsNullOrWhiteSpace(tokenResponse?.AccessToken) ? null : tokenResponse.AccessToken;
         }