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I just purchased the game for a second time a few weeks ago. I already own a copy of the game through steam installed and linked to a different account. I mess around with my friends on my account and wanted a second account where I can try harder and push up in ranked. Every time I try to launch through the new account it kicks me out and gives me that error.
Hi there Shadow_Shibbi, welcome to the forums.
When you see the message - "There was a problem authenticating the ownership of this product."
This usually means the game is connected to either the wrong Steam account or the wrong Ubisoft account.
In order to help you find the correct account you would need to get in touch with us through our support channels as we are unable to ask you personal identifiable information over the forums.
Twitter Support - https://twitter.com/UbisoftSupport
Facebook Support - https://www.facebook.com/UbisoftSupportUK/
Ubisoft Support Website - https://support.ubisoft.com/en-gb/Cases/New
If you reach out to us via our social media channels, please make it a private Direct Message with your Ubisoft ID or Ubisoft email address, also any platform account names you may have linked such as console, Steam or Epic as this can help locate your account.
We will try our best to get back to you within 48 hours and we will verify your account to prove ownership then proceed to help you with your account