To confirm, it works... ubisoft support lied to me... just got season pass 3 for 7 quid gg
I bought my copy via epic, but also bought the dlc direct and it worked fine for me, although I am hesitant to tell you 100% that it will work for you as well. I am planning on getting season 2 through this deal as well though so I guess I will find out if they've made it so it doesn't work. It might be worth noting that I have never installed it via the epic launcher. I just linked my Ubisoft account and then installed directly via uplay, and launch it from there.
I...bought y1 for 8 pounds. I used 100 ubi points. I used to have 3000 points but Ubi started gradually wiping my balance off my account....shrug. so I have s1 and s2 for 14 pounds. Not bad. S3 next year lol
I did it to get a season pass for Immortals, which i bought on epic. got the season pass in this sale and it worked fine.
All the dlc is quality tbh. Best anno around