It says it was a problem with athentification of ownership (bought on steam )
Hey BadSpider1!
Thanks for reaching out to us and I am sorry to hear about the issue you ran into.
To find out more about the issue you're dealing with, have a look at the following article.
Essentially, the reason you're receiving this error message is because you're connecting to the wrong Uplay account. To have this resolved, you need to make sure you are connecting to the right one and error will no longer appear.
Should you still experience difficulties with this, let us know!