diff --git a/apps/mobile-app/app/(tabs)/settings/security/delete-account.tsx b/apps/mobile-app/app/(tabs)/settings/security/delete-account.tsx
index c3a062a8b..ebcc51b60 100644
--- a/apps/mobile-app/app/(tabs)/settings/security/delete-account.tsx
+++ b/apps/mobile-app/app/(tabs)/settings/security/delete-account.tsx
@@ -154,7 +154,12 @@ export default function DeleteAccountScreen(): React.ReactNode {
       const data = await webApi.post<DeleteAccountInitiateRequest, DeleteAccountInitiateResponse>('Auth/delete-account/initiate', deleteAccountInitiateRequest);
       const currentSalt = data.salt;
       const currentServerEphemeral = data.serverEphemeral;
-      const srpIdentity = data.srpIdentity;
+      
+      /**
+       * Use srpIdentity from server response if available, otherwise fall back to username.
+       * Note: the fallback can be removed in the future after 0.26.0+ is deployed.
+       */    
+      const srpIdentity = data.srpIdentity ?? username;
 
       setLoadingStatus(t('settings.securitySettings.deleteAccount.verifyingWithServer'));
       // Convert base64 string to hex string
diff --git a/apps/mobile-app/hooks/useVaultMutate.ts b/apps/mobile-app/hooks/useVaultMutate.ts
index 8ba5ac85d..d1f2139dd 100644
--- a/apps/mobile-app/hooks/useVaultMutate.ts
+++ b/apps/mobile-app/hooks/useVaultMutate.ts
@@ -185,7 +185,10 @@ export function useVaultMutate() : {
       throw new Error(t('common.errors.unknownError'));
     }
 
-    // Use srpIdentity from server response if available, otherwise fall back to username.
+    /**
+     * Use srpIdentity from server response if available, otherwise fall back to username.
+     * Note: the fallback can be removed in the future after 0.26.0+ is deployed.
+     */    
     const srpIdentity = data.srpIdentity ?? username;
     const privateKey = await NativeVaultManager.srpDerivePrivateKey(currentSalt, srpIdentity, currentPasswordHashString);
     const newClientSession = await NativeVaultManager.srpDeriveSession(