diff --git a/packages/beacon-node/src/api/impl/beacon/pool/index.ts b/packages/beacon-node/src/api/impl/beacon/pool/index.ts
index 170c358fe417..09a66eba4d15 100644
--- a/packages/beacon-node/src/api/impl/beacon/pool/index.ts
+++ b/packages/beacon-node/src/api/impl/beacon/pool/index.ts
@@ -8,7 +8,12 @@ import {validateApiVoluntaryExit} from "../../../../chain/validation/voluntaryEx
 import {validateApiBlsToExecutionChange} from "../../../../chain/validation/blsToExecutionChange.js";
 import {validateApiSyncCommittee} from "../../../../chain/validation/syncCommittee.js";
 import {ApiModules} from "../../types.js";
-import {AttestationError, GossipAction, SyncCommitteeError} from "../../../../chain/errors/index.js";
+import {
+  AttestationError,
+  AttestationErrorCode,
+  GossipAction,
+  SyncCommitteeError,
+} from "../../../../chain/errors/index.js";
 import {validateGossipFnRetryUnknownRoot} from "../../../../network/processor/gossipHandlers.js";
 
 export function getBeaconPoolApi({
@@ -77,12 +82,17 @@ export function getBeaconPoolApi({
             const sentPeers = await network.publishBeaconAttestation(attestation, subnet);
             metrics?.onPoolSubmitUnaggregatedAttestation(seenTimestampSec, indexedAttestation, subnet, sentPeers);
           } catch (e) {
+            const logCtx = {slot: attestation.data.slot, index: attestation.data.index};
+
+            if (e instanceof AttestationError && e.type.code === AttestationErrorCode.ATTESTATION_ALREADY_KNOWN) {
+              logger.debug("Ignoring known attestation", logCtx);
+              // Attestations might already be published by another node as part of a fallback setup or DVT cluster
+              // and can reach our node by gossip before the api. The error can be ignored and should not result in a 500 response.
+              return;
+            }
+
             errors.push(e as Error);
-            logger.error(
-              `Error on submitPoolAttestations [${i}]`,
-              {slot: attestation.data.slot, index: attestation.data.index},
-              e as Error
-            );
+            logger.error(`Error on submitPoolAttestations [${i}]`, logCtx, e as Error);
             if (e instanceof AttestationError && e.action === GossipAction.REJECT) {
               chain.persistInvalidSszValue(ssz.phase0.Attestation, attestation, "api_reject");
             }
@@ -224,7 +234,7 @@ export function getBeaconPoolApi({
       );
 
       if (errors.length > 1) {
-        throw Error("Multiple errors on publishAggregateAndProofs\n" + errors.map((e) => e.message).join("\n"));
+        throw Error("Multiple errors on submitPoolSyncCommitteeSignatures\n" + errors.map((e) => e.message).join("\n"));
       } else if (errors.length === 1) {
         throw errors[0];
       }
diff --git a/packages/beacon-node/src/api/impl/validator/index.ts b/packages/beacon-node/src/api/impl/validator/index.ts
index fc5cf953018d..e795d1c5afad 100644
--- a/packages/beacon-node/src/api/impl/validator/index.ts
+++ b/packages/beacon-node/src/api/impl/validator/index.ts
@@ -36,7 +36,13 @@ import {
 } from "@lodestar/types";
 import {ExecutionStatus} from "@lodestar/fork-choice";
 import {toHex, racePromisesWithCutoff, RaceEvent} from "@lodestar/utils";
-import {AttestationError, AttestationErrorCode, GossipAction, SyncCommitteeError} from "../../../chain/errors/index.js";
+import {
+  AttestationError,
+  AttestationErrorCode,
+  GossipAction,
+  SyncCommitteeError,
+  SyncCommitteeErrorCode,
+} from "../../../chain/errors/index.js";
 import {validateApiAggregateAndProof} from "../../../chain/validation/index.js";
 import {ZERO_HASH} from "../../../constants/index.js";
 import {SyncState} from "../../../sync/index.js";
@@ -1073,20 +1079,18 @@ export function getValidatorApi({
             const sentPeers = await network.publishBeaconAggregateAndProof(signedAggregateAndProof);
             metrics?.onPoolSubmitAggregatedAttestation(seenTimestampSec, indexedAttestation, sentPeers);
           } catch (e) {
+            const logCtx = {
+              slot: signedAggregateAndProof.message.aggregate.data.slot,
+              index: signedAggregateAndProof.message.aggregate.data.index,
+            };
+
             if (e instanceof AttestationError && e.type.code === AttestationErrorCode.AGGREGATOR_ALREADY_KNOWN) {
-              logger.debug("Ignoring known signedAggregateAndProof");
+              logger.debug("Ignoring known signedAggregateAndProof", logCtx);
               return; // Ok to submit the same aggregate twice
             }
 
             errors.push(e as Error);
-            logger.error(
-              `Error on publishAggregateAndProofs [${i}]`,
-              {
-                slot: signedAggregateAndProof.message.aggregate.data.slot,
-                index: signedAggregateAndProof.message.aggregate.data.index,
-              },
-              e as Error
-            );
+            logger.error(`Error on publishAggregateAndProofs [${i}]`, logCtx, e as Error);
             if (e instanceof AttestationError && e.action === GossipAction.REJECT) {
               chain.persistInvalidSszValue(ssz.phase0.SignedAggregateAndProof, signedAggregateAndProof, "api_reject");
             }
@@ -1128,15 +1132,21 @@ export function getValidatorApi({
             );
             await network.publishContributionAndProof(contributionAndProof);
           } catch (e) {
+            const logCtx = {
+              slot: contributionAndProof.message.contribution.slot,
+              subcommitteeIndex: contributionAndProof.message.contribution.subcommitteeIndex,
+            };
+
+            if (
+              e instanceof SyncCommitteeError &&
+              e.type.code === SyncCommitteeErrorCode.SYNC_COMMITTEE_AGGREGATOR_ALREADY_KNOWN
+            ) {
+              logger.debug("Ignoring known contributionAndProof", logCtx);
+              return; // Ok to submit the same aggregate twice
+            }
+
             errors.push(e as Error);
-            logger.error(
-              `Error on publishContributionAndProofs [${i}]`,
-              {
-                slot: contributionAndProof.message.contribution.slot,
-                subcommitteeIndex: contributionAndProof.message.contribution.subcommitteeIndex,
-              },
-              e as Error
-            );
+            logger.error(`Error on publishContributionAndProofs [${i}]`, logCtx, e as Error);
             if (e instanceof SyncCommitteeError && e.action === GossipAction.REJECT) {
               chain.persistInvalidSszValue(ssz.altair.SignedContributionAndProof, contributionAndProof, "api_reject");
             }