You may unlink individual platform accounts from an Activision account once every 12 months.
Follow these steps to unlink a platform account:
Sign in to your Activision account.
In the ACCOUNT LINKING section, find the account you wish to unlink and select UNLINK.
Please note: Games with cross-progression store game progress on your Activision account, not your platform account. If you choose to link your platform account to another Activision account, your progress will not carry over. Your progress and content aren't lost. If you relink this platform account to the original Activision account, you can continue your progression and access your owned content.
Check the confirmation box and select CONTINUE.
If you wish to unlink an account due to a lost password or an email account you can no longer access, follow the steps below to reset the password or email address for your Activision account.
Go to the Activision account login page.
Choose the platform account you wish to use to log in, and you'll be redirected to the platform's login page.
Log in to your platform account, and you'll be redirected back to the Activision website.
Hover over your Display Name at the top of the page and select BASIC INFO.
Select EDIT next to your password.
Enter a new password, reenter the same password, then select SAVE.
In the pop-up, select the same platform you chose in Step 2.
Return to BASIC INFO and select EDIT next to the email address.
Enter a valid email address you can access and select SAVE.
In the pop-up, enter your new password from Step 6.