diff --git a/src/data-pump/flowcore-client.ts b/src/data-pump/flowcore-client.ts
index d047bda..f3e31eb 100644
--- a/src/data-pump/flowcore-client.ts
+++ b/src/data-pump/flowcore-client.ts
@@ -13,7 +13,8 @@ export function getFlowcoreClient(auth: FlowcoreDataPumpAuth, baseUrlOverride?:
   const client = "apiKey" in auth
     ? new FlowcoreClientWithMetrics({
       apiKey: auth.apiKey,
-      apiKeyId: auth.apiKeyId as string,
+      // apiKeyId is guaranteed to be set — FlowcoreDataPump.create() parses it from fc_ keys
+      apiKeyId: auth.apiKeyId!,
     })
     : new FlowcoreClientWithMetrics(auth)
 
diff --git a/src/data-pump/notifier.ts b/src/data-pump/notifier.ts
index 01e04bf..87427ea 100644
--- a/src/data-pump/notifier.ts
+++ b/src/data-pump/notifier.ts
@@ -143,7 +143,8 @@ export class FlowcoreNotifier {
     if ("apiKey" in this.options.auth) {
       return {
         apiKey: this.options.auth.apiKey,
-        apiKeyId: this.options.auth.apiKeyId as string,
+        // apiKeyId is guaranteed to be set — FlowcoreDataPump.create() parses it from fc_ keys
+        apiKeyId: this.options.auth.apiKeyId!,
       }
     }
     const getBearerToken = this.options.auth.getBearerToken