diff --git a/src/app/api/v1/rep-dashboard/route.ts b/src/app/api/v1/rep-dashboard/route.ts
index 4dabd7b..cccec94 100644
--- a/src/app/api/v1/rep-dashboard/route.ts
+++ b/src/app/api/v1/rep-dashboard/route.ts
@@ -12,15 +12,48 @@ import { getRepDashboardData } from "@/lib/server/rep-dashboard-service";
 export const runtime = "nodejs";
 export const dynamic = "force-dynamic";
 
+/**
+ * Extract the most informative message from a thrown error.
+ *
+ * PB SDK errors carry `error.response` (the raw ClientResponseError with
+ * `message`, `status`, and PB's `data` payload) — when PB rejects a
+ * filter as 400, the detail often lives in `error.response.data.message`
+ * or `error.data.message`, NOT in `error.message` (which is a generic
+ * "Failed to fetch."). Walk the chain so the page UI can show the real
+ * reason instead of a generic toast.
+ */
+function extractErrorMessage(error: unknown): string {
+  if (!(error instanceof Error)) return "Failed to load rep dashboard";
+  const anyErr = error as Error & {
+    status?: number;
+    data?: { message?: string };
+    response?: { message?: string; data?: { message?: string } };
+  };
+  const status = anyErr.status || anyErr.response?.data ? 400 : 500;
+  void status;
+  return (
+    anyErr.response?.data?.message ||
+    anyErr.data?.message ||
+    anyErr.response?.message ||
+    anyErr.message ||
+    "Failed to load rep dashboard"
+  );
+}
+
 export async function GET(req: NextRequest) {
   try {
     const sessionUser = await getBrowserSessionUser(req);
     const data = await getRepDashboardData(sessionUser.id);
     return NextResponse.json(data);
   } catch (error) {
-    const message =
-      error instanceof Error ? error.message : "Failed to load rep dashboard";
-    const status = (error as Error & { status?: number }).status || 500;
+    // Log the full error server-side so we can diagnose without needing
+    // the browser devtools open.
+    console.error("[rep-dashboard] failed:", error);
+    const message = extractErrorMessage(error);
+    const status =
+      (error as Error & { status?: number }).status ||
+      (error as { response?: { status?: number } }).response?.status ||
+      500;
     return NextResponse.json({ error: message }, { status });
   }
 }
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