Hi there, sorry to hear you are experiencing this problem while attempting to install Assassins Creed : Origins.
For reference, a game license key is only able to be activated on on Ubisoft account. If you have played this in the past, the product should already be available in tour Ubisoft game library to install and launch.
If you are still experiencing this issue, please feel free to contact us and provide an image showing the proof of purchase for this product and the key you are attempting to redeem and one of our dedicated support team would be able to assist further.