@ubi-keo thanks for your quick help - already had a chat this morning with a customer support agent and he opened a ticket. Thanks for your help !!!

So previous Saturday (July 10th) I've purchased the Season Pass for Assassins Creed Valhala, and after install in it, I'm having some issues accessing the Wrath of the Druids DLC (all of this on a PS4). I've had to manually download it and install it through the add-ons tab, and after that, I can see a couple of new skills and abilities slots that I imagine are from the DLC, yet the NPC that should start the Ireland quest doesn't show up. I've deleted and re-installed the AC app from the playstation, updated it to the most recent version, and then proceed with installing the season pass, yet the issue persists. Worth noting that I've already completed the main quest of the game, so I think it should have been accessible by now. 

Would appreciate a hand in sorting this out. Thank you!