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Thank you for contacting Ubisoft Support.
The authentication error is indeed caused by the fact that the game licenses are in different accounts.
To verify what can be done to fix this, please reach out to our main support using this[www.ubisoft.com] link.
They should be able to verify the situation and provide the best solution to sort this out.
Should you need further info, feel free to get in touch with us again.
Thank you very much.
- Ubisoft Support