diff --git a/vorgang-manager-server/src/test/java/de/ozgcloud/nachrichten/antragraum/AntragraumITCase.java b/vorgang-manager-server/src/test/java/de/ozgcloud/nachrichten/antragraum/AntragraumITCase.java
index 51f3cdcefce8386b38119051129a0b6e11148b90..5d2ababcc186088b078edd586f942066dc4a8bf5 100644
--- a/vorgang-manager-server/src/test/java/de/ozgcloud/nachrichten/antragraum/AntragraumITCase.java
+++ b/vorgang-manager-server/src/test/java/de/ozgcloud/nachrichten/antragraum/AntragraumITCase.java
@@ -264,7 +264,7 @@ class AntragraumITCase {
 
 		private Vorgang savedVorgang;
 		private VorgangAttachedItem vorgangAttachedItem;
-		private VorgangAttachedItem vorgangAttachedItemOtherAttachment;
+		private VorgangAttachedItem vorgangAttachedItemDifferentAttachment;
 		private String fileId;
 
 		@BeforeEach
@@ -273,7 +273,7 @@ class AntragraumITCase {
 			savedVorgang = mongoOperations.save(createVorgang(TrustLevel.LEVEL_3), Vorgang.COLLECTION_NAME);
 			vorgangAttachedItem = mongoOperations.save(createPostfachNachrichtVorgangAttachedItem(savedVorgang.getId(), fileId),
 					VorgangAttachedItem.COLLECTION_NAME);
-			vorgangAttachedItemOtherAttachment = mongoOperations.save(createPostfachNachrichtVorgangAttachedItem(savedVorgang.getId()),
+			vorgangAttachedItemDifferentAttachment = mongoOperations.save(createPostfachNachrichtVorgangAttachedItem(savedVorgang.getId()),
 					VorgangAttachedItem.COLLECTION_NAME);
 		}
 
@@ -358,14 +358,14 @@ class AntragraumITCase {
 			when(decrypter.decryptPostfachId(any())).thenReturn(PostfachAddressTestFactory.STRING_BASED_IDENTIFIER_POSTFACH_ID_VALUE);
 			var request = GrpcGetAttachmentMetadataRequest.newBuilder()
 					.setSamlToken(SAML_TOKEN)
-					.setNachrichtId(vorgangAttachedItemOtherAttachment.getId())
+					.setNachrichtId(vorgangAttachedItemDifferentAttachment.getId())
 					.setFileId(fileId)
 					.build();
 
 			assertThatThrownBy(() -> grpcService.getAttachmentMetadata(request, responseObserver))
 					.isInstanceOf(NotFoundException.class)
 					.hasMessageContaining("PostfachNachricht")
-					.hasMessageContaining(vorgangAttachedItemOtherAttachment.getId());
+					.hasMessageContaining(vorgangAttachedItemDifferentAttachment.getId());
 		}
 
 	}
@@ -383,6 +383,7 @@ class AntragraumITCase {
 
 		private Vorgang savedVorgang;
 		private VorgangAttachedItem vorgangAttachedItem;
+		private VorgangAttachedItem vorgangAttachedItemDifferentAttachment;
 		private String fileId;
 
 		@BeforeEach
@@ -391,6 +392,8 @@ class AntragraumITCase {
 			savedVorgang = mongoOperations.save(createVorgang(TrustLevel.LEVEL_3), Vorgang.COLLECTION_NAME);
 			vorgangAttachedItem = mongoOperations.save(createPostfachNachrichtVorgangAttachedItem(savedVorgang.getId(), fileId),
 					VorgangAttachedItem.COLLECTION_NAME);
+			vorgangAttachedItemDifferentAttachment = mongoOperations.save(createPostfachNachrichtVorgangAttachedItem(savedVorgang.getId()),
+					VorgangAttachedItem.COLLECTION_NAME);
 		}
 
 		@Test
@@ -410,6 +413,75 @@ class AntragraumITCase {
 			verify(responseObserver, timeout(30000)).onNext(captor.capture());
 			assertThat(captor.getValue().getFileContent()).isEqualTo(expectedContent);
 		}
+
+		@Test
+		void shouldFailDueToInvalidToken() {
+			when(verifier.verify(any())).thenReturn(List.of(new Saml2Error("invalid_signature", "Signature missing")));
+			when(decrypter.decryptTrustLevel(any())).thenReturn(TrustLevel.LEVEL_3.getValue());
+			when(decrypter.decryptPostfachId(any())).thenReturn(PostfachAddressTestFactory.STRING_BASED_IDENTIFIER_POSTFACH_ID_VALUE);
+			var request = GrpcGetAttachmentContentRequest.newBuilder()
+					.setSamlToken(SAML_TOKEN)
+					.setNachrichtId(vorgangAttachedItem.getId())
+					.setFileId(fileId)
+					.build();
+
+			assertThatThrownBy(() -> grpcService.getAttachmentContent(request, responseObserver))
+					.isInstanceOf(SecurityException.class)
+					.hasMessageContaining("Signature missing")
+					.hasMessageContaining("invalid_signature");
+
+		}
+
+		@Test
+		void shouldFailDueIncorrectPostfachId() {
+			when(verifier.verify(any())).thenReturn(Collections.emptyList());
+			when(decrypter.decryptTrustLevel(any())).thenReturn(TrustLevel.LEVEL_3.getValue());
+			when(decrypter.decryptPostfachId(any())).thenReturn("wrong ID");
+			var request = GrpcGetAttachmentContentRequest.newBuilder()
+					.setSamlToken(SAML_TOKEN)
+					.setNachrichtId(vorgangAttachedItem.getId())
+					.setFileId(fileId)
+					.build();
+
+			assertThatThrownBy(() -> grpcService.getAttachmentContent(request, responseObserver))
+					.isInstanceOf(NotFoundException.class)
+					.hasMessageContaining("PostfachNachricht")
+					.hasMessageContaining(vorgangAttachedItem.getId());
+		}
+
+		@Test
+		void shouldFailDueToTrustLevelTooLow() {
+			when(verifier.verify(any())).thenReturn(Collections.emptyList());
+			when(decrypter.decryptTrustLevel(any())).thenReturn(TrustLevel.LEVEL_2.getValue());
+			when(decrypter.decryptPostfachId(any())).thenReturn(PostfachAddressTestFactory.STRING_BASED_IDENTIFIER_POSTFACH_ID_VALUE);
+			var request = GrpcGetAttachmentContentRequest.newBuilder()
+					.setSamlToken(SAML_TOKEN)
+					.setNachrichtId(vorgangAttachedItem.getId())
+					.setFileId(fileId)
+					.build();
+
+			assertThatThrownBy(() -> grpcService.getAttachmentContent(request, responseObserver))
+					.isInstanceOf(NotFoundException.class)
+					.hasMessageContaining("PostfachNachricht")
+					.hasMessageContaining(vorgangAttachedItem.getId());
+		}
+
+		@Test
+		void shouldFailDueToFileIdNotInPostfachNachricht() {
+			when(verifier.verify(any())).thenReturn(Collections.emptyList());
+			when(decrypter.decryptTrustLevel(any())).thenReturn(TrustLevel.LEVEL_3.getValue());
+			when(decrypter.decryptPostfachId(any())).thenReturn(PostfachAddressTestFactory.STRING_BASED_IDENTIFIER_POSTFACH_ID_VALUE);
+			var request = GrpcGetAttachmentContentRequest.newBuilder()
+					.setSamlToken(SAML_TOKEN)
+					.setNachrichtId(vorgangAttachedItem.getId())
+					.setFileId(fileId)
+					.build();
+
+			assertThatThrownBy(() -> grpcService.getAttachmentContent(request, responseObserver))
+					.isInstanceOf(NotFoundException.class)
+					.hasMessageContaining("PostfachNachricht")
+					.hasMessageContaining(vorgangAttachedItemDifferentAttachment.getId());
+		}
 	}
 
 	private Vorgang createVorgang(TrustLevel trustLevel) {