diff --git a/backend/src/ee/routes/v1/external-kms-routers/external-kms-endpoints.ts b/backend/src/ee/routes/v1/external-kms-routers/external-kms-endpoints.ts
index 47b4947f2..871523713 100644
--- a/backend/src/ee/routes/v1/external-kms-routers/external-kms-endpoints.ts
+++ b/backend/src/ee/routes/v1/external-kms-routers/external-kms-endpoints.ts
@@ -88,9 +88,11 @@ export const registerExternalKmsEndpoints = <
         ...rest
       } = externalKms;
 
+      const credentialsToHash = JSON.stringify(configuration.credential);
+
       const credentialsHash = crypto.nativeCrypto
         .createHash("sha256")
-        .update(externalKmsData.encryptedProviderInputs)
+        .update(Buffer.from(credentialsToHash))
         .digest("hex");
       return { ...rest, externalKms: { ...externalKmsData, configuration, credentialsHash } };
     }
@@ -153,9 +155,12 @@ export const registerExternalKmsEndpoints = <
         external: { providerInput: externalKmsConfiguration, ...externalKmsData },
         ...rest
       } = externalKms;
+
+      const credentialsToHash = JSON.stringify(externalKmsConfiguration.credential);
+
       const credentialsHash = crypto.nativeCrypto
         .createHash("sha256")
-        .update(externalKmsData.encryptedProviderInputs)
+        .update(Buffer.from(credentialsToHash))
         .digest("hex");
       return { ...rest, externalKms: { ...externalKmsData, configuration: externalKmsConfiguration, credentialsHash } };
     }
@@ -222,9 +227,12 @@ export const registerExternalKmsEndpoints = <
         external: { providerInput: externalKmsConfiguration, ...externalKmsData },
         ...rest
       } = externalKms;
+
+      const credentialsToHash = JSON.stringify(externalKmsConfiguration.credential);
+
       const credentialsHash = crypto.nativeCrypto
         .createHash("sha256")
-        .update(externalKmsData.encryptedProviderInputs)
+        .update(Buffer.from(credentialsToHash))
         .digest("hex");
       return { ...rest, externalKms: { ...externalKmsData, configuration: externalKmsConfiguration, credentialsHash } };
     }
@@ -277,9 +285,12 @@ export const registerExternalKmsEndpoints = <
         external: { providerInput: configuration, ...externalKmsData },
         ...rest
       } = externalKms;
+
+      const credentialsToHash = JSON.stringify(configuration.credential);
+
       const credentialsHash = crypto.nativeCrypto
         .createHash("sha256")
-        .update(externalKmsData.encryptedProviderInputs)
+        .update(Buffer.from(credentialsToHash))
         .digest("hex");
 
       return { ...rest, externalKms: { ...externalKmsData, configuration, credentialsHash } };
diff --git a/backend/src/ee/services/external-kms/external-kms-service.ts b/backend/src/ee/services/external-kms/external-kms-service.ts
index eb595ee02..af246eacd 100644
--- a/backend/src/ee/services/external-kms/external-kms-service.ts
+++ b/backend/src/ee/services/external-kms/external-kms-service.ts
@@ -380,6 +380,7 @@ export const externalKmsServiceFactory = ({
 
   const findById = async ({ actor, actorId, actorOrgId, actorAuthMethod, id: kmsId }: TGetExternalKmsByIdDTO) => {
     const kmsDoc = await kmsDAL.findById(kmsId);
+    if (!kmsDoc) throw new NotFoundError({ message: `Could not find KMS with ID '${kmsId}'` });
     const { permission } = await permissionService.getOrgPermission({
       scope: OrganizationActionScope.Any,
       actor,