diff --git a/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/ExperimentalOptions.cs b/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/ExperimentalOptions.cs
index 25b345ac96e..86c180ff377 100644
--- a/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/ExperimentalOptions.cs
+++ b/src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/ExperimentalOptions.cs
@@ -29,7 +29,7 @@ public ExperimentalOptions(IConfiguration configuration)
             this.EmitLogEventAttributes = emitLogEventAttributes;
         }
 
-        if (configuration.TryGetStringValue(OtlpRetryEnvVar, out var retryPolicy) && retryPolicy != null)
+        if (configuration.TryGetStringValue(OtlpRetryEnvVar, out var retryPolicy))
         {
             if (retryPolicy.Equals("in_memory", StringComparison.OrdinalIgnoreCase))
             {
@@ -38,7 +38,7 @@ public ExperimentalOptions(IConfiguration configuration)
             else if (retryPolicy.Equals("disk", StringComparison.OrdinalIgnoreCase))
             {
                 this.EnableDiskRetry = true;
-                if (configuration.TryGetStringValue(OtlpDiskRetryDirectoryPathEnvVar, out var path) && path != null)
+                if (configuration.TryGetStringValue(OtlpDiskRetryDirectoryPathEnvVar, out var path))
                 {
                     this.DiskRetryDirectoryPath = path;
                 }
diff --git a/src/OpenTelemetry.Exporter.Zipkin/ZipkinExporterOptions.cs b/src/OpenTelemetry.Exporter.Zipkin/ZipkinExporterOptions.cs
index 1f4bcd14684..161ab174b2f 100644
--- a/src/OpenTelemetry.Exporter.Zipkin/ZipkinExporterOptions.cs
+++ b/src/OpenTelemetry.Exporter.Zipkin/ZipkinExporterOptions.cs
@@ -42,7 +42,7 @@ internal ZipkinExporterOptions(
 
         if (configuration!.TryGetUriValue(ZipkinExporterEventSource.Log, ZipkinEndpointEnvVar, out var endpoint))
         {
-            this.Endpoint = endpoint!;
+            this.Endpoint = endpoint;
         }
 
         this.BatchExportProcessorOptions = defaultBatchOptions!;
diff --git a/src/OpenTelemetry/Logs/LoggerProviderSdk.cs b/src/OpenTelemetry/Logs/LoggerProviderSdk.cs
index cc502387d0c..74354e2bfbb 100644
--- a/src/OpenTelemetry/Logs/LoggerProviderSdk.cs
+++ b/src/OpenTelemetry/Logs/LoggerProviderSdk.cs
@@ -2,9 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 using System.Diagnostics;
-#if NETSTANDARD2_1_OR_GREATER || NET
 using System.Diagnostics.CodeAnalysis;
-#endif
 using System.Text;
 using Microsoft.Extensions.DependencyInjection;
 using OpenTelemetry.Internal;
@@ -201,9 +199,7 @@ public bool ContainsBatchProcessor(BaseProcessor<LogRecord> processor)
 #endif
         override bool TryCreateLogger(
         string? name,
-#if NETSTANDARD2_1_OR_GREATER || NET
         [NotNullWhen(true)]
-#endif
         out Logger? logger)
     {
         logger = new LoggerSdk(this, name);
diff --git a/src/OpenTelemetry/Resources/OtelEnvResourceDetector.cs b/src/OpenTelemetry/Resources/OtelEnvResourceDetector.cs
index 41b5e7f28b1..87c76a9f0c3 100644
--- a/src/OpenTelemetry/Resources/OtelEnvResourceDetector.cs
+++ b/src/OpenTelemetry/Resources/OtelEnvResourceDetector.cs
@@ -24,7 +24,7 @@ public Resource Detect()
 
         if (this.configuration.TryGetStringValue(EnvVarKey, out string? envResourceAttributeValue))
         {
-            var attributes = ParseResourceAttributes(envResourceAttributeValue!);
+            var attributes = ParseResourceAttributes(envResourceAttributeValue);
             resource = new Resource(attributes);
         }
 
diff --git a/src/OpenTelemetry/Resources/OtelServiceNameEnvVarDetector.cs b/src/OpenTelemetry/Resources/OtelServiceNameEnvVarDetector.cs
index 0b58f1d55b4..4bee4eadbbb 100644
--- a/src/OpenTelemetry/Resources/OtelServiceNameEnvVarDetector.cs
+++ b/src/OpenTelemetry/Resources/OtelServiceNameEnvVarDetector.cs
@@ -24,7 +24,7 @@ public Resource Detect()
         {
             resource = new Resource(new Dictionary<string, object>
             {
-                [ResourceSemanticConventions.AttributeServiceName] = envResourceAttributeValue!,
+                [ResourceSemanticConventions.AttributeServiceName] = envResourceAttributeValue,
             });
         }
 
diff --git a/src/Shared/Configuration/OpenTelemetryConfigurationExtensions.cs b/src/Shared/Configuration/OpenTelemetryConfigurationExtensions.cs
index c713fd166dd..589f960d512 100644
--- a/src/Shared/Configuration/OpenTelemetryConfigurationExtensions.cs
+++ b/src/Shared/Configuration/OpenTelemetryConfigurationExtensions.cs
@@ -2,9 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 using System.Diagnostics;
-#if !NETFRAMEWORK && !NETSTANDARD2_0
 using System.Diagnostics.CodeAnalysis;
-#endif
 using System.Globalization;
 
 namespace Microsoft.Extensions.Configuration;
@@ -13,17 +11,13 @@ internal static class OpenTelemetryConfigurationExtensions
 {
     public delegate bool TryParseFunc<T>(
         string value,
-#if !NETFRAMEWORK && !NETSTANDARD2_0
         [NotNullWhen(true)]
-#endif
         out T? parsedValue);
 
     public static bool TryGetStringValue(
         this IConfiguration configuration,
         string key,
-#if !NETFRAMEWORK && !NETSTANDARD2_0
         [NotNullWhen(true)]
-#endif
         out string? value)
     {
         Debug.Assert(configuration != null, "configuration was null");
@@ -37,9 +31,7 @@ public static bool TryGetUriValue(
         this IConfiguration configuration,
         IConfigurationExtensionsLogger logger,
         string key,
-#if !NETFRAMEWORK && !NETSTANDARD2_0
         [NotNullWhen(true)]
-#endif
         out Uri? value)
     {
         Debug.Assert(logger != null, "logger was null");
@@ -52,7 +44,7 @@ public static bool TryGetUriValue(
 
         if (!Uri.TryCreate(stringValue, UriKind.Absolute, out value))
         {
-            logger!.LogInvalidConfigurationValue(key, stringValue!);
+            logger!.LogInvalidConfigurationValue(key, stringValue);
             return false;
         }
 
@@ -75,7 +67,7 @@ public static bool TryGetIntValue(
 
         if (!int.TryParse(stringValue, NumberStyles.None, CultureInfo.InvariantCulture, out value))
         {
-            logger!.LogInvalidConfigurationValue(key, stringValue!);
+            logger!.LogInvalidConfigurationValue(key, stringValue);
             return false;
         }
 
@@ -98,7 +90,7 @@ public static bool TryGetBoolValue(
 
         if (!bool.TryParse(stringValue, out value))
         {
-            logger!.LogInvalidConfigurationValue(key, stringValue!);
+            logger!.LogInvalidConfigurationValue(key, stringValue);
             return false;
         }
 
@@ -110,9 +102,7 @@ public static bool TryGetValue<T>(
         IConfigurationExtensionsLogger logger,
         string key,
         TryParseFunc<T> tryParseFunc,
-#if !NETFRAMEWORK && !NETSTANDARD2_0
         [NotNullWhen(true)]
-#endif
         out T? value)
     {
         Debug.Assert(logger != null, "logger was null");
@@ -123,9 +113,9 @@ public static bool TryGetValue<T>(
             return false;
         }
 
-        if (!tryParseFunc(stringValue!, out value))
+        if (!tryParseFunc(stringValue, out value))
         {
-            logger!.LogInvalidConfigurationValue(key, stringValue!);
+            logger!.LogInvalidConfigurationValue(key, stringValue);
             return false;
         }
 
diff --git a/test/OpenTelemetry.Api.Tests/Logs/LoggerProviderTests.cs b/test/OpenTelemetry.Api.Tests/Logs/LoggerProviderTests.cs
index 27078c6307e..24415c12fb4 100644
--- a/test/OpenTelemetry.Api.Tests/Logs/LoggerProviderTests.cs
+++ b/test/OpenTelemetry.Api.Tests/Logs/LoggerProviderTests.cs
@@ -1,9 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#if NETSTANDARD2_1_OR_GREATER || NET
 using System.Diagnostics.CodeAnalysis;
-#endif
 using Xunit;
 
 namespace OpenTelemetry.Logs.Tests;
@@ -66,9 +64,7 @@ protected override bool TryCreateLogger(
         internal override bool TryCreateLogger(
 #endif
             string? name,
-#if NETSTANDARD2_1_OR_GREATER || NET
             [NotNullWhen(true)]
-#endif
             out Logger? logger)
         {
             logger = new TestLogger(name);
diff --git a/test/OpenTelemetry.Api.Tests/OpenTelemetry.Api.Tests.csproj b/test/OpenTelemetry.Api.Tests/OpenTelemetry.Api.Tests.csproj
index 2e88e5a9587..71d7890fa44 100644
--- a/test/OpenTelemetry.Api.Tests/OpenTelemetry.Api.Tests.csproj
+++ b/test/OpenTelemetry.Api.Tests/OpenTelemetry.Api.Tests.csproj
@@ -17,6 +17,7 @@
     <Compile Include="$(RepoRoot)\test\OpenTelemetry.Tests\Shared\SkipUnlessEnvVarFoundFactAttribute.cs" Link="Includes\SkipUnlessEnvVarFoundFactAttribute.cs" />
     <Compile Include="$(RepoRoot)\test\OpenTelemetry.Tests\Shared\TestEventListener.cs" Link="Includes\TestEventListener.cs" />
     <Compile Include="$(RepoRoot)\test\OpenTelemetry.Tests\Shared\Utils.cs" Link="Includes\Utils.cs" />
+    <Compile Include="$(RepoRoot)\src\Shared\Shims\NullableAttributes.cs" Link="Includes\Shims\NullableAttributes.cs" />
   </ItemGroup>
 
   <ItemGroup>