diff --git a/packages/auth/src/Bootstrap/Container.ts b/packages/auth/src/Bootstrap/Container.ts
index 225523255..1a0f580db 100644
--- a/packages/auth/src/Bootstrap/Container.ts
+++ b/packages/auth/src/Bootstrap/Container.ts
@@ -460,11 +460,7 @@ export class ContainerConfigLoader {
       .toConstantValue(env.get('U2F_RELYING_PARTY_NAME', true) ?? 'Standard Notes')
     container
       .bind(TYPES.U2F_RELYING_PARTY_ID)
-      .toConstantValue(
-        env.get('U2F_RELYING_PARTY_ID', true)
-          ? env.get('U2F_RELYING_PARTY_ID', true).split(',')
-          : ['standardnotes.com'],
-      )
+      .toConstantValue(env.get('U2F_RELYING_PARTY_ID', true) ?? 'standardnotes.com')
     container
       .bind(TYPES.U2F_EXPECTED_ORIGIN)
       .toConstantValue(
diff --git a/packages/auth/src/Domain/UseCase/VerifyAuthenticatorAuthenticationResponse/VerifyAuthenticatorAuthenticationResponse.spec.ts b/packages/auth/src/Domain/UseCase/VerifyAuthenticatorAuthenticationResponse/VerifyAuthenticatorAuthenticationResponse.spec.ts
index e443c6ade..34d4cb849 100644
--- a/packages/auth/src/Domain/UseCase/VerifyAuthenticatorAuthenticationResponse/VerifyAuthenticatorAuthenticationResponse.spec.ts
+++ b/packages/auth/src/Domain/UseCase/VerifyAuthenticatorAuthenticationResponse/VerifyAuthenticatorAuthenticationResponse.spec.ts
@@ -16,7 +16,7 @@ describe('VerifyAuthenticatorAuthenticationResponse', () => {
     new VerifyAuthenticatorAuthenticationResponse(
       authenticatorRepository,
       authenticatorChallengeRepository,
-      ['standardnotes.com'],
+      'standardnotes.com',
       ['localhost', 'https://app.standardnotes.com'],
       true,
     )
diff --git a/packages/auth/src/Domain/UseCase/VerifyAuthenticatorAuthenticationResponse/VerifyAuthenticatorAuthenticationResponse.ts b/packages/auth/src/Domain/UseCase/VerifyAuthenticatorAuthenticationResponse/VerifyAuthenticatorAuthenticationResponse.ts
index 041827671..2720dcaee 100644
--- a/packages/auth/src/Domain/UseCase/VerifyAuthenticatorAuthenticationResponse/VerifyAuthenticatorAuthenticationResponse.ts
+++ b/packages/auth/src/Domain/UseCase/VerifyAuthenticatorAuthenticationResponse/VerifyAuthenticatorAuthenticationResponse.ts
@@ -10,7 +10,7 @@ export class VerifyAuthenticatorAuthenticationResponse implements UseCaseInterfa
   constructor(
     private authenticatorRepository: AuthenticatorRepositoryInterface,
     private authenticatorChallengeRepository: AuthenticatorChallengeRepositoryInterface,
-    private relyingPartyId: string[],
+    private relyingPartyId: string,
     private expectedOrigin: string[],
     private requireUserVerification: boolean,
   ) {}
diff --git a/packages/auth/src/Domain/UseCase/VerifyAuthenticatorRegistrationResponse/VerifyAuthenticatorRegistrationResponse.spec.ts b/packages/auth/src/Domain/UseCase/VerifyAuthenticatorRegistrationResponse/VerifyAuthenticatorRegistrationResponse.spec.ts
index 51dc107db..1f20033c0 100644
--- a/packages/auth/src/Domain/UseCase/VerifyAuthenticatorRegistrationResponse/VerifyAuthenticatorRegistrationResponse.spec.ts
+++ b/packages/auth/src/Domain/UseCase/VerifyAuthenticatorRegistrationResponse/VerifyAuthenticatorRegistrationResponse.spec.ts
@@ -16,7 +16,7 @@ describe('VerifyAuthenticatorRegistrationResponse', () => {
     new VerifyAuthenticatorRegistrationResponse(
       authenticatorRepository,
       authenticatorChallengeRepository,
-      ['standardnotes.com'],
+      'standardnotes.com',
       ['localhost', 'https://app.standardnotes.com'],
       true,
     )
diff --git a/packages/auth/src/Domain/UseCase/VerifyAuthenticatorRegistrationResponse/VerifyAuthenticatorRegistrationResponse.ts b/packages/auth/src/Domain/UseCase/VerifyAuthenticatorRegistrationResponse/VerifyAuthenticatorRegistrationResponse.ts
index bc78041bd..5d71406e2 100644
--- a/packages/auth/src/Domain/UseCase/VerifyAuthenticatorRegistrationResponse/VerifyAuthenticatorRegistrationResponse.ts
+++ b/packages/auth/src/Domain/UseCase/VerifyAuthenticatorRegistrationResponse/VerifyAuthenticatorRegistrationResponse.ts
@@ -10,7 +10,7 @@ export class VerifyAuthenticatorRegistrationResponse implements UseCaseInterface
   constructor(
     private authenticatorRepository: AuthenticatorRepositoryInterface,
     private authenticatorChallengeRepository: AuthenticatorChallengeRepositoryInterface,
-    private relyingPartyId: string[],
+    private relyingPartyId: string,
     private expectedOrigin: string[],
     private requireUserVerification: boolean,
   ) {}