I'm still having an issue looting grizzly skins on PC - even long after the live event has ended. All grizzly bears just drop black bear skins.
My game is up to date, and I've completed the live event. My Ubi account does show a previous reward that I'm unable to collect. If I click the link to say collect all, it doesn't do anything and still says I have 1 to collect. I'm not sure if that is linked to the issue with the skins or not.
Nevermind - after I posted this next time I played the game I got grizzly skins. I don't know what fixed it as I had waited quite a while and tried multiple methods to correct it.