diff --git a/backend/src/services/certificate-authority/acme/acme-certificate-authority-fns.ts b/backend/src/services/certificate-authority/acme/acme-certificate-authority-fns.ts
index 05047274eef..619eb967cc3 100644
--- a/backend/src/services/certificate-authority/acme/acme-certificate-authority-fns.ts
+++ b/backend/src/services/certificate-authority/acme/acme-certificate-authority-fns.ts
@@ -54,7 +54,7 @@ import {
 import { azureDnsDeleteTxtRecord, azureDnsInsertTxtRecord } from "./dns-providers/azure-dns";
 import { cloudflareDeleteTxtRecord, cloudflareInsertTxtRecord } from "./dns-providers/cloudflare";
 import { dnsMadeEasyDeleteTxtRecord, dnsMadeEasyInsertTxtRecord } from "./dns-providers/dns-made-easy";
-import { route53DeleteTxtRecord, route53InsertTxtRecord } from "./dns-providers/route54";
+import { route53DeleteTxtRecord, route53InsertTxtRecord } from "./dns-providers/route53";
 
 const validateDnsResolver = (resolver: string): void => {
   const appCfg = getConfig();
diff --git a/backend/src/services/certificate-authority/acme/dns-providers/route54.ts b/backend/src/services/certificate-authority/acme/dns-providers/route53.ts
similarity index 93%
rename from backend/src/services/certificate-authority/acme/dns-providers/route54.ts
rename to backend/src/services/certificate-authority/acme/dns-providers/route53.ts
index e2878ad4835..a405e2e0b5a 100644
--- a/backend/src/services/certificate-authority/acme/dns-providers/route54.ts
+++ b/backend/src/services/certificate-authority/acme/dns-providers/route53.ts
@@ -12,7 +12,7 @@ export const route53InsertTxtRecord = async (
   domain: string,
   value: string
 ) => {
-  const config = await getAwsConnectionConfig(connection, AWSRegion.US_WEST_1); // REGION is irrelevant because Route53 is global
+  const config = await getAwsConnectionConfig(connection, AWSRegion.US_EAST_1); // Route53 is global; us-east-1 STS endpoint is always active
   const route53Client = new Route53Client({
     sha256: CustomAWSHasher,
     useFipsEndpoint: crypto.isFipsModeEnabled(),
@@ -47,7 +47,7 @@ export const route53DeleteTxtRecord = async (
   domain: string,
   value: string
 ) => {
-  const config = await getAwsConnectionConfig(connection, AWSRegion.US_WEST_1); // REGION is irrelevant because Route53 is global
+  const config = await getAwsConnectionConfig(connection, AWSRegion.US_EAST_1); // Route53 is global; us-east-1 STS endpoint is always active
   const route53Client = new Route53Client({
     credentials: config.credentials,
     region: config.region