diff --git a/packages/domain/src/fingerprint-discovery.test.ts b/packages/domain/src/fingerprint-discovery.test.ts
index bf22317..23ae781 100644
--- a/packages/domain/src/fingerprint-discovery.test.ts
+++ b/packages/domain/src/fingerprint-discovery.test.ts
@@ -156,6 +156,73 @@ describe("discoverFingerprintMatches", () => {
     });
   });
 
+  it("finds nothing rather than failing when the root has no readable roster", async () => {
+    // Break caught: Blizzard 404s a character it holds no current profile for,
+    // which would discard an otherwise good Raider.IO snapshot and retry a root
+    // that can never be swept.
+    await expect(
+      discoverFingerprintMatches(
+        root,
+        {
+          async getGuildRoster() {
+            throw Object.assign(new Error("missing"), { kind: "not_found" });
+          },
+          async getAchievementFingerprint() {
+            throw new Error("unreachable");
+          }
+        },
+        options
+      )
+    ).resolves.toEqual({ kind: "matched", requestsUsed: 1, characters: [] });
+  });
+
+  it("finds nothing rather than failing when the root has no readable profile", async () => {
+    // Break caught: the same 404 on the root's own achievements would strand the
+    // run instead of publishing its Raider.IO result.
+    await expect(
+      discoverFingerprintMatches(
+        root,
+        gatewayFor([candidate(matchingKey)], {}),
+        options
+      )
+    ).resolves.toEqual({ kind: "matched", requestsUsed: 2, characters: [] });
+  });
+
+  it("skips a candidate with no readable profile and keeps sweeping", async () => {
+    // Break caught: a roster member whose achievements are unreadable is
+    // ordinary — the measured live sweep saw 23 of 393 — so treating one as an
+    // upstream failure would abandon every real sweep and publish nothing.
+    const outcome = await discoverFingerprintMatches(
+      root,
+      gatewayFor(
+        [
+          candidate({ region: "eu", realm: "silvermoon", name: "a-missing" }),
+          candidate(matchingKey)
+        ],
+        {
+          [keyId(root)]: fingerprint(200),
+          [keyId(matchingKey)]: fingerprint(200)
+        }
+      ),
+      { ...options, requestCap: 4, isSuppressed: async () => false }
+    );
+
+    expect(outcome).toEqual({
+      kind: "matched",
+      requestsUsed: 4,
+      characters: [
+        {
+          key: matchingKey,
+          displayName: "matching",
+          className: "Mage",
+          level: 80,
+          raiderIoUrl: "https://raider.io/characters/eu/silvermoon/matching",
+          source: "fingerprint"
+        }
+      ]
+    });
+  });
+
   it("rechecks privacy immediately before admitting a matched candidate", async () => {
     // Break caught: a privacy-hidden designation that lands while the candidate
     // fingerprint is being fetched could still be retained in the result.
diff --git a/packages/domain/src/fingerprint-discovery.ts b/packages/domain/src/fingerprint-discovery.ts
index 58eef1b..b8273c1 100644
--- a/packages/domain/src/fingerprint-discovery.ts
+++ b/packages/domain/src/fingerprint-discovery.ts
@@ -50,6 +50,15 @@ export type DiscoverFingerprintMatchesOptions = {
   signal?: AbortSignal;
 };
 
+function isNotFound(error: unknown): boolean {
+  return (
+    typeof error === "object" &&
+    error !== null &&
+    "kind" in error &&
+    error.kind === "not_found"
+  );
+}
+
 function isCharacterKey(value: unknown): value is CharacterKey {
   if (typeof value !== "object" || value === null) return false;
 
@@ -211,17 +220,37 @@ export async function discoverFingerprintMatches(
   }
 
   try {
-    const roster = await request(() =>
-      gateway.getGuildRoster(root, options.signal)
-    );
+    // Blizzard holds no current profile for plenty of characters Raider.IO
+    // knows, and answers 404. That makes this root unsweepable rather than the
+    // upstream broken, so report an empty sweep and let its Raider.IO snapshot
+    // publish instead of stranding the run on a retry that cannot succeed.
+    let roster: readonly FingerprintCandidate[] | typeof budgetExhausted;
+    try {
+      roster = await request(() =>
+        gateway.getGuildRoster(root, options.signal)
+      );
+    } catch (error) {
+      if (isNotFound(error)) {
+        return { kind: "matched", characters: [], requestsUsed };
+      }
+      throw error;
+    }
     if (roster === budgetExhausted) {
       return { kind: "capped", characters: [], requestsUsed };
     }
     if (!isCandidateList(roster)) throw { kind: "schema_drift" };
 
-    const rootFingerprint = await request(() =>
-      gateway.getAchievementFingerprint(root, options.signal)
-    );
+    let rootFingerprint: ReadonlyMap<number, number> | typeof budgetExhausted;
+    try {
+      rootFingerprint = await request(() =>
+        gateway.getAchievementFingerprint(root, options.signal)
+      );
+    } catch (error) {
+      if (isNotFound(error)) {
+        return { kind: "matched", characters: [], requestsUsed };
+      }
+      throw error;
+    }
     if (rootFingerprint === budgetExhausted) {
       return { kind: "capped", characters: [], requestsUsed };
     }
@@ -249,9 +278,19 @@ export async function discoverFingerprintMatches(
       throwIfAborted();
       if (isPrivacyHidden) continue;
 
-      const candidateFingerprint = await request(() =>
-        gateway.getAchievementFingerprint(candidate.key, options.signal)
-      );
+      // A roster member with no readable achievement profile is ordinary, not an
+      // upstream fault: the measured live sweep saw 23 of 393 candidates return
+      // one. Skip the candidate and keep the request it already consumed.
+      let candidateFingerprint:
+        ReadonlyMap<number, number> | typeof budgetExhausted;
+      try {
+        candidateFingerprint = await request(() =>
+          gateway.getAchievementFingerprint(candidate.key, options.signal)
+        );
+      } catch (error) {
+        if (isNotFound(error)) continue;
+        throw error;
+      }
       if (candidateFingerprint === budgetExhausted) break;
       if (!isFingerprint(candidateFingerprint)) throw { kind: "schema_drift" };