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Credits: @rayark_.(discord), hvnonlnd(discord)
Ans:.Follow these steps in-game: Menu -> Settings -> Account Settings -> User Center. Once there, click on the "Unlink" button. Important:
Your Kuro Games account progress will not be lost, but it will no longer be synced with your PSN account.
Google and email are separate things, and PSN does not accept Google accounts.
Please note that you can only unlink one PSN account per Kuro Games account, so proceed with caution.
Wuthering Waves PS5 FAQ: https://wutheringwaves.kurogames.com/m/en/main/news/detail/1858
Full Credits : @asheliapanda(discord)
1) When you log into the game on PC/mobile, do you currently
A) Log in by entering in an email address, a password, and hit log in, or
B) Click on Apple ID/Google/FB/Twitter and log in that way?
If your answer is A, then the process is very simple:
-->Open the game on PS5, it prompts if you want to log into an existing Kuro Account or create a new one. Choose to log in to an existing Kuro Account, and then just log in as normal.
If your answer is B:
-->Open the game on your other device (Not PS5), and go to Settings>Account Settings>User Center. It should look like the picture. Click "Link" and add an email and password. Once this is done, THEN You can go back and do the steps I outlined for Answer A.
Do note: PSN Wuwa is region locked. You will be forced to play on the server that your PSN account is set to. You cannot change this. So if you play on Wuwa EU servers but have an NA PSN Account, you must make a brand new PSN Account and set the country to one in Europe. And link to that.