Thanks for your reply f_afa, sorry to see your friends are still appearing offline.
Can you let me know if you are using Windows 10 and if your OS is fully updated? If you are using an older version of Windows prior to Windows 10, you may not have the full functionality of Ubisoft Connect, as you may need to enable TLS 1.2 as explained in this guide >
https://www.ubisoft.com/help?article=000097837
Some functions such as chat, friends list, or game invites may not be available on Windows OS prior to 10, because of security reasons.
I would also ask you to make sure you have Ubisoft Connect installed and not the previous Uplay launcher, as it is no longer updated and could be causing issues also >
https://ubisoftconnect.com/en-GB/
Please get back to us when you can, if this does not resolve your issue, we can make you a support ticket for further help with this.