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Thanks for reaching out and I'm sorry to hear that you are experiencing an authentication error.
This error usually means that you are trying to start your game from the wrong Ubisoft account, where your game hasn't been originally activated.
If this problem persists, feel free to create a {LINK REMOVED}ticket on our support page.
You can also contact us via social media: {LINK REMOVED}Facebook or Twitter.
Our team will be more than happy to assist you further.
If you have any additional questions, please let us know.
- Ubisoft Support
Like mentioned by UbiMark you need to open a ticket on our website here : {LINK REMOVED} Ubisoft Support Contact
We will be able to provide further support when you open your ticket.
If you have any additional questions, please let us know.
-Ubisoft support