diff --git a/spring-grpc-core/src/main/java/org/springframework/grpc/server/security/GrpcSecurity.java b/spring-grpc-core/src/main/java/org/springframework/grpc/server/security/GrpcSecurity.java
index d0ee2be..5ead14d 100644
--- a/spring-grpc-core/src/main/java/org/springframework/grpc/server/security/GrpcSecurity.java
+++ b/spring-grpc-core/src/main/java/org/springframework/grpc/server/security/GrpcSecurity.java
@@ -106,7 +106,7 @@ public final class GrpcSecurity
 		}
 		else {
 			ObservationRegistry registry = getObservationRegistry();
-			AuthenticationManager manager = getAuthenticationRegistry().build();
+			AuthenticationManager manager = getAuthenticationManager();
 			if (!registry.isNoop() && manager != null) {
 				setSharedObject(AuthenticationManager.class, new ObservationAuthenticationManager(registry, manager));
 			}
@@ -119,6 +119,10 @@ public final class GrpcSecurity
 				new CompositeAuthenticationExtractor(this.authenticationExtractors), this.authorizationManager);
 	}
 
+	private AuthenticationManager getAuthenticationManager() throws Exception {
+		return getAuthenticationRegistry().getOrBuild();
+	}
+
 	public GrpcSecurity authenticationProvider(AuthenticationProvider authenticationProvider) {
 		getAuthenticationRegistry().authenticationProvider(authenticationProvider);
 		return this;
diff --git a/spring-grpc-spring-boot-autoconfigure/src/main/java/org/springframework/grpc/autoconfigure/server/security/GrpcSecurityAutoConfiguration.java b/spring-grpc-spring-boot-autoconfigure/src/main/java/org/springframework/grpc/autoconfigure/server/security/GrpcSecurityAutoConfiguration.java
index 1a7cef1..f4f9a2e 100644
--- a/spring-grpc-spring-boot-autoconfigure/src/main/java/org/springframework/grpc/autoconfigure/server/security/GrpcSecurityAutoConfiguration.java
+++ b/spring-grpc-spring-boot-autoconfigure/src/main/java/org/springframework/grpc/autoconfigure/server/security/GrpcSecurityAutoConfiguration.java
@@ -35,6 +35,7 @@ import org.springframework.grpc.server.security.SecurityGrpcExceptionHandler;
 import org.springframework.security.concurrent.DelegatingSecurityContextExecutor;
 import org.springframework.security.config.ObjectPostProcessor;
 import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
+import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
 import org.springframework.security.web.SecurityFilterChain;
 
 import io.grpc.ServerBuilder;
@@ -62,7 +63,11 @@ public class GrpcSecurityAutoConfiguration {
 
 		@Bean
 		public GrpcSecurity grpcSecurity(ObjectPostProcessor<Object> objectPostProcessor,
-				AuthenticationManagerBuilder authenticationManagerBuilder, ApplicationContext context) {
+				AuthenticationConfiguration authenticationConfiguration, ApplicationContext context) throws Exception {
+			AuthenticationManagerBuilder authenticationManagerBuilder = authenticationConfiguration
+				.authenticationManagerBuilder(objectPostProcessor, context);
+			authenticationManagerBuilder
+				.parentAuthenticationManager(authenticationConfiguration.getAuthenticationManager());
 			return new GrpcSecurity(objectPostProcessor, authenticationManagerBuilder, context);
 		}
 
diff --git a/spring-grpc-spring-boot-autoconfigure/src/test/java/org/springframework/grpc/autoconfigure/server/security/GrpcSecurityAutoConfigurationTests.java b/spring-grpc-spring-boot-autoconfigure/src/test/java/org/springframework/grpc/autoconfigure/server/security/GrpcSecurityAutoConfigurationTests.java
index 8595179..d5df78c 100644
--- a/spring-grpc-spring-boot-autoconfigure/src/test/java/org/springframework/grpc/autoconfigure/server/security/GrpcSecurityAutoConfigurationTests.java
+++ b/spring-grpc-spring-boot-autoconfigure/src/test/java/org/springframework/grpc/autoconfigure/server/security/GrpcSecurityAutoConfigurationTests.java
@@ -27,6 +27,7 @@ import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.grpc.autoconfigure.server.GrpcServerAutoConfiguration;
 import org.springframework.grpc.server.exception.GrpcExceptionHandler;
 import org.springframework.grpc.server.lifecycle.GrpcServerLifecycle;
+import org.springframework.grpc.server.security.AuthenticationProcessInterceptor;
 import org.springframework.grpc.server.security.SecurityGrpcExceptionHandler;
 import org.springframework.security.config.ObjectPostProcessor;
 
@@ -72,9 +73,10 @@ class GrpcSecurityAutoConfigurationTests {
 
 	@Test
 	void grpcSecurityAutoConfiguredAsExpected() {
-		this.contextRunner()
-			.run((context) -> assertThat(context).getBean(GrpcExceptionHandler.class)
-				.isInstanceOf(SecurityGrpcExceptionHandler.class));
+		this.contextRunner().run((context) -> {
+			assertThat(context).getBean(GrpcExceptionHandler.class).isInstanceOf(SecurityGrpcExceptionHandler.class);
+			assertThat(context).getBean(AuthenticationProcessInterceptor.class).isNull();
+		});
 	}
 
 }