diff --git a/apps/desktop/src/app/services/set-initial-password/desktop-set-initial-password.service.ts b/apps/desktop/src/app/services/set-initial-password/desktop-set-initial-password.service.ts
index 1406e822860..691a83489a6 100644
--- a/apps/desktop/src/app/services/set-initial-password/desktop-set-initial-password.service.ts
+++ b/apps/desktop/src/app/services/set-initial-password/desktop-set-initial-password.service.ts
@@ -1,7 +1,7 @@
 import { OrganizationUserApiService } from "@bitwarden/admin-console/common";
 import { DefaultSetInitialPasswordService } from "@bitwarden/angular/auth/password-management/set-initial-password/default-set-initial-password.service.implementation";
 import {
-  SetInitialPasswordCredentials,
+  SetInitialPasswordCredentialsOld,
   SetInitialPasswordCredentialsV2,
   SetInitialPasswordService,
   SetInitialPasswordUserType,
@@ -54,12 +54,12 @@ export class DesktopSetInitialPasswordService
   /**
    * @deprecated To be removed in PM-28143
    */
-  override async setInitialPassword(
-    credentials: SetInitialPasswordCredentials,
+  override async setInitialPasswordOld(
+    credentials: SetInitialPasswordCredentialsOld,
     userType: SetInitialPasswordUserType,
     userId: UserId,
   ) {
-    await super.setInitialPassword(credentials, userType, userId);
+    await super.setInitialPasswordOld(credentials, userType, userId);
 
     this.messagingService.send("redrawMenu");
   }
diff --git a/apps/web/src/app/auth/core/services/password-management/set-initial-password/web-set-initial-password.service.ts b/apps/web/src/app/auth/core/services/password-management/set-initial-password/web-set-initial-password.service.ts
index 8a2290b140c..9f076cc062c 100644
--- a/apps/web/src/app/auth/core/services/password-management/set-initial-password/web-set-initial-password.service.ts
+++ b/apps/web/src/app/auth/core/services/password-management/set-initial-password/web-set-initial-password.service.ts
@@ -1,7 +1,7 @@
 import { OrganizationUserApiService } from "@bitwarden/admin-console/common";
 import { DefaultSetInitialPasswordService } from "@bitwarden/angular/auth/password-management/set-initial-password/default-set-initial-password.service.implementation";
 import {
-  SetInitialPasswordCredentials,
+  SetInitialPasswordCredentialsOld,
   SetInitialPasswordCredentialsV2,
   SetInitialPasswordService,
   SetInitialPasswordUserType,
@@ -56,12 +56,12 @@ export class WebSetInitialPasswordService
   /**
    * @deprecated To be removed in PM-28143
    */
-  override async setInitialPassword(
-    credentials: SetInitialPasswordCredentials,
+  override async setInitialPasswordOld(
+    credentials: SetInitialPasswordCredentialsOld,
     userType: SetInitialPasswordUserType,
     userId: UserId,
   ) {
-    await super.setInitialPassword(credentials, userType, userId);
+    await super.setInitialPasswordOld(credentials, userType, userId);
 
     /**
      * TODO: Investigate refactoring the following logic in https://bitwarden.atlassian.net/browse/PM-22615
diff --git a/libs/angular/src/auth/password-management/set-initial-password/default-set-initial-password.service.implementation.ts b/libs/angular/src/auth/password-management/set-initial-password/default-set-initial-password.service.implementation.ts
index a04d5f811af..afb15a17005 100644
--- a/libs/angular/src/auth/password-management/set-initial-password/default-set-initial-password.service.implementation.ts
+++ b/libs/angular/src/auth/password-management/set-initial-password/default-set-initial-password.service.implementation.ts
@@ -36,7 +36,7 @@ import { PureCrypto } from "@bitwarden/sdk-internal";
 
 import {
   SetInitialPasswordService,
-  SetInitialPasswordCredentials,
+  SetInitialPasswordCredentialsOld,
   SetInitialPasswordUserType,
   SetInitialPasswordTdeOffboardingCredentials,
   SetInitialPasswordCredentialsV2,
@@ -60,8 +60,8 @@ export class DefaultSetInitialPasswordService implements SetInitialPasswordServi
   /**
    * @deprecated To be removed in PM-28143
    */
-  async setInitialPassword(
-    credentials: SetInitialPasswordCredentials,
+  async setInitialPasswordOld(
+    credentials: SetInitialPasswordCredentialsOld,
     userType: SetInitialPasswordUserType,
     userId: UserId,
   ): Promise<void> {
@@ -162,7 +162,7 @@ export class DefaultSetInitialPasswordService implements SetInitialPasswordServi
     await this.masterPasswordService.setForceSetPasswordReason(ForceSetPasswordReason.None, userId);
 
     // User now has a password so update account decryption options in state
-    await this.updateAccountDecryptionProperties(
+    await this.updateAccountDecryptionPropertiesOld(
       newMasterKey,
       kdfConfig,
       masterKeyEncryptedUserKey,
@@ -366,7 +366,7 @@ export class DefaultSetInitialPasswordService implements SetInitialPasswordServi
   /**
    * @deprecated To be removed in PM-28143
    */
-  private async updateAccountDecryptionProperties(
+  private async updateAccountDecryptionPropertiesOld(
     masterKey: MasterKey,
     kdfConfig: KdfConfig,
     masterKeyEncryptedUserKey: [UserKey, EncString],
diff --git a/libs/angular/src/auth/password-management/set-initial-password/set-initial-password.component.ts b/libs/angular/src/auth/password-management/set-initial-password/set-initial-password.component.ts
index 75eb8e8ce01..6b280ab78fb 100644
--- a/libs/angular/src/auth/password-management/set-initial-password/set-initial-password.component.ts
+++ b/libs/angular/src/auth/password-management/set-initial-password/set-initial-password.component.ts
@@ -23,7 +23,6 @@ import { SsoLoginServiceAbstraction } from "@bitwarden/common/auth/abstractions/
 import { ForceSetPasswordReason } from "@bitwarden/common/auth/models/domain/force-set-password-reason";
 import { assertTruthy, assertNonNullish } from "@bitwarden/common/auth/utils";
 import { InternalMasterPasswordServiceAbstraction } from "@bitwarden/common/key-management/master-password/abstractions/master-password.service.abstraction";
-import { ConfigService } from "@bitwarden/common/platform/abstractions/config/config.service";
 import { I18nService } from "@bitwarden/common/platform/abstractions/i18n.service";
 import { LogService } from "@bitwarden/common/platform/abstractions/log.service";
 import { MessagingService } from "@bitwarden/common/platform/abstractions/messaging.service";
@@ -40,7 +39,7 @@ import {
 import { I18nPipe } from "@bitwarden/ui-common";
 
 import {
-  SetInitialPasswordCredentials,
+  SetInitialPasswordCredentialsOld,
   SetInitialPasswordCredentialsV2,
   SetInitialPasswordService,
   SetInitialPasswordTdeOffboardingCredentials,
@@ -73,7 +72,6 @@ export class SetInitialPasswordComponent implements OnInit {
     private accountService: AccountService,
     private activatedRoute: ActivatedRoute,
     private anonLayoutWrapperDataService: AnonLayoutWrapperDataService,
-    private configService: ConfigService,
     private dialogService: DialogService,
     private i18nService: I18nService,
     private logoutService: LogoutService,
@@ -204,7 +202,7 @@ export class SetInitialPasswordComponent implements OnInit {
           return;
         }
 
-        await this.setInitialPassword(passwordInputResult);
+        await this.setInitialPasswordOld(passwordInputResult);
 
         break;
       }
@@ -222,7 +220,7 @@ export class SetInitialPasswordComponent implements OnInit {
   /**
    * @deprecated To be removed in PM-28143
    */
-  private async setInitialPassword(passwordInputResult: PasswordInputResult) {
+  private async setInitialPasswordOld(passwordInputResult: PasswordInputResult) {
     const ctx = "Could not set initial password.";
     assertTruthy(passwordInputResult.newMasterKey, "newMasterKey", ctx);
     assertTruthy(passwordInputResult.newServerMasterKeyHash, "newServerMasterKeyHash", ctx);
@@ -238,7 +236,7 @@ export class SetInitialPasswordComponent implements OnInit {
     assertNonNullish(this.resetPasswordAutoEnroll, "resetPasswordAutoEnroll", ctx); // can have `false` as a valid value, so check non-nullish
 
     try {
-      const credentials: SetInitialPasswordCredentials = {
+      const credentials: SetInitialPasswordCredentialsOld = {
         newMasterKey: passwordInputResult.newMasterKey,
         newServerMasterKeyHash: passwordInputResult.newServerMasterKeyHash,
         newLocalMasterKeyHash: passwordInputResult.newLocalMasterKeyHash,
@@ -251,7 +249,7 @@ export class SetInitialPasswordComponent implements OnInit {
         salt: passwordInputResult.salt,
       };
 
-      await this.setInitialPasswordService.setInitialPassword(
+      await this.setInitialPasswordService.setInitialPasswordOld(
         credentials,
         this.userType,
         this.userId,
diff --git a/libs/angular/src/auth/password-management/set-initial-password/set-initial-password.service.abstraction.ts b/libs/angular/src/auth/password-management/set-initial-password/set-initial-password.service.abstraction.ts
index 95765b5cb0f..0d43d79d46e 100644
--- a/libs/angular/src/auth/password-management/set-initial-password/set-initial-password.service.abstraction.ts
+++ b/libs/angular/src/auth/password-management/set-initial-password/set-initial-password.service.abstraction.ts
@@ -45,7 +45,7 @@ export const SetInitialPasswordUserType: Readonly<{
 /**
  * @deprecated To be removed in PM-28143
  */
-export interface SetInitialPasswordCredentials {
+export interface SetInitialPasswordCredentialsOld {
   newMasterKey: MasterKey;
   newServerMasterKeyHash: string;
   newLocalMasterKeyHash: string;
@@ -90,8 +90,8 @@ export abstract class SetInitialPasswordService {
    * @throws If any property on the `credentials` object is null or undefined, or if a
    *         masterKeyEncryptedUserKey or newKeyPair could not be created.
    */
-  abstract setInitialPassword: (
-    credentials: SetInitialPasswordCredentials,
+  abstract setInitialPasswordOld: (
+    credentials: SetInitialPasswordCredentialsOld,
     userType: SetInitialPasswordUserType,
     userId: UserId,
   ) => Promise<void>;
diff --git a/libs/auth/src/angular/input-password/password-input-result.ts b/libs/auth/src/angular/input-password/password-input-result.ts
index a13c754b93c..bba56cc278e 100644
--- a/libs/auth/src/angular/input-password/password-input-result.ts
+++ b/libs/auth/src/angular/input-password/password-input-result.ts
@@ -16,7 +16,7 @@ export interface PasswordInputResult {
    *
    * To be removed in PM-28143
    */
-  newApisFlagEnabled: boolean;
+  newApisFlagEnabled?: boolean;
 
   // The deprecated properties below will be removed in PM-28143: https://bitwarden.atlassian.net/browse/PM-28143