How to Fix Dokkan Facebook Link Error ?

If you’re a Dragon Ball Z Dokkan Battle player, you might have come across the frustrating “Linking Error – A problem occurred when logging into Facebook. Data transfer could not be completed” message when trying to log in. For many, this error has locked them out of their accounts after a device reset, reinstall, or when attempting to transfer data.

This guide explains the problem, why it happens, and some possible solutions to get your account back.

The Problem: Dokkan Facebook Linking Error

Players report that when they try to log in via Facebook, Dokkan recognizes the account (e.g., showing “You’ve previously logged in to DBZDBWW”) but then throws the Facebook Linking Error message.

Common scenarios include:

After a factory reset or reinstalling the app.
Attempting to transfer an account between devices.
Errors appearing on both iOS and Android versions of Dokkan.
Some players also get “Invalid Facebook ID” instead of the usual linking error.

Frustratingly, this issue exists on both the global and JP versions of Dokkan.

Why It Happens

The root causes vary, but user reports suggest a few common triggers:

iOS 18 compatibility issues: Several players mention the error started after updating to iOS 18.
Broken Facebook integration: Dokkan’s Facebook login can be unreliable, especially after updates or patches.
Incorrect transfer option: Choosing “transfer game data” instead of “transfer device data” has caused errors for some.
Server-side issues: Bandai’s servers sometimes block or misread Facebook logins, leading to the “Invalid ID” message.

How to fix Dokkan Facebook Link Error ?

While there isn’t a guaranteed fix for everyone, here are solutions that have worked for some players:

1. Reinstall Facebook and Log In via Browser

Delete the Facebook app from your device.
Open Dokkan and attempt to link via Facebook — this will redirect you to a browser login.
Once the link is successful, reinstall the Facebook app.

2. Try the “Transfer Device Data” Option

Some players report success by choosing “Transfer device data” instead of “Transfer game data from Facebook.”
This may display your Facebook-linked data differently, allowing you to proceed.

3. Use Another Device or Emulator

Oddly enough, some users found that Facebook login works fine on PC emulators like Bluestacks even when it fails on iOS or Android.
If you can log in there, immediately link your account to another method (Google, Apple ID, Bandai Namco ID).

4. Submit a Support Request to Bandai

If nothing works, contact Bandai Namco support.
Provide your Player ID, rank, purchase receipts (if applicable), and details of your account (notable characters, units, etc.).
Example: “One day inactive, one dupe of Ultimate Gohan as lead” — details like these help prove ownership.

5. Avoid Facebook-Only Linking in the Future

Once you recover your account, immediately link it to multiple platforms (Google, Apple, Bandai Namco ID). Relying on Facebook alone is risky given the recurring bugs.

Final Thoughts

The Dokkan Facebook link error has been plaguing both global and JP servers, leaving many players locked out of their accounts. While frustrating, there are workarounds like browser-based login, trying emulators, or switching transfer options.

If you’re affected, don’t panic — persistence and reaching out to Bandai support often help. And once you’re back in, be sure to secure your account with multiple login methods to avoid future lockouts.

👉 Have you run into this issue yourself? What fix worked for you? Share your experience in the comments!