diff --git a/functions/src/__tests__/providers-dataverse.test.js b/functions/src/__tests__/providers-dataverse.test.js
index f9d0284..5c9e268 100644
--- a/functions/src/__tests__/providers-dataverse.test.js
+++ b/functions/src/__tests__/providers-dataverse.test.js
@@ -1351,4 +1351,25 @@ describe("9. validateStaticToken", () => {
 
     expect(result).toBe(false);
   });
+
+  it("logs the status and body of a non-200, with the token scrubbed", async () => {
+    const warn = jest.spyOn(console, "warn").mockImplementation(() => {});
+    mockFetch.mockResolvedValueOnce(
+      mockResponse({
+        status: 403,
+        statusText: "Forbidden",
+        textBody: '{"status":"ERROR","message":"Bad api key test-token"}',
+      })
+    );
+
+    await dataverseProvider.validateStaticToken(auth);
+
+    expect(warn).toHaveBeenCalledTimes(1);
+    const [message] = warn.mock.calls[0];
+    expect(message).toContain("403");
+    expect(message).toContain(SERVER_URL);
+    expect(message).toContain("Bad api key [redacted]");
+    expect(message).not.toContain("test-token");
+    warn.mockRestore();
+  });
 });
diff --git a/functions/src/providers/dataverse.ts b/functions/src/providers/dataverse.ts
index 7e2bac1..1e9d2ba 100644
--- a/functions/src/providers/dataverse.ts
+++ b/functions/src/providers/dataverse.ts
@@ -423,7 +423,21 @@ export const dataverseProvider: StorageProvider = {
     });
     // Never throw on a non-200 -- a bad/expired token is simply "not valid",
     // not an exceptional condition.
-    return response.status === 200;
+    if (response.status === 200) return true;
+
+    // Log what the installation actually said. The caller collapses every
+    // non-200 into "Invalid API token", so without this a real 401, a WAF
+    // 403, and an outage 5xx are indistinguishable after the fact. The body
+    // is truncated (a WAF block page can be large) and scrubbed of the token
+    // in case an installation echoes the key back in its error message.
+    let body = "";
+    try {
+      body = (await response.text()).split(auth.token).join("[redacted]").slice(0, 300);
+    } catch {
+      // Body is diagnostic only; an unreadable one still leaves the status.
+    }
+    console.warn(`dataverse validateStaticToken: ${serverUrl}/api/users/:me returned ${response.status}: ${body}`);
+    return false;
   },
 
   // Reads the token's expiry from the one endpoint that reports it, GET