you provided zero info to go on as to what your problem may be >>??
are we supposed to just guess ?
Please see the Ubisoft Support Troubleshooting page here and please go through the steps provided
https://support.ubi.com/en-GB/faqs/0...oubleshooting/
If you still have an issue, Please Contact Ubisoft Support Directly.
you can do so from that above LINKED page .. or here...to open a support ticket / case
https://support.ubi.com