I have an issue with a Season Pass to AC Origins

You will have to pay for the DLC as it does not transfer to Xbox. The dlc is here on this page under add-ons for this game, just select what you want, and purchase it. You do not need Ubisoft Plus to download or play the game and DLC.

https://www.xbox.com/en-gb/games/store/Assassins-Creed-Origins/BZGJRJC1FGF3

I see. What exactly is the CD Key for?

Please note that game licenses from PC platform may differ from licenses from console. Unless a game is part of Xbox Play Anywhere titles. If you wanted to play it on the console, you must subscribe to Ubisoft+ subscription.

I bought CD Key on ENEBA used it on Uplay and i don't see any dlc to download it's season pass DLC

Hi Rosiek!

If I may ask, what DLCs are you trying to install specifically for me to check it here?

Please note that you may be required to subscribe to Ubisoft+ subscription to have access to the game's DLCs.

I HAVE A FIX! (hopefully for everyone) CONFIRMED WORKING!

If you do not have access to the BETA Dashboard program, there is another way to fix the issue. If you have Assassin's Creed Black Flag and have it's season pass installed, there is a conflict. The season pass for AC Blackflag has the exact same file name
as the season pass for Shadow of Mordor season pass.

Delete Shadow of Mordor Season Pass. Delete AC Blackflag season pass. Reinstall Mordor Season Pass. Confirmed install. After new october dashboard update comes out in 7 days for everyone, (the BETA one they are talking about) you will be able to reinstall
the season pass for AC Blackflag as the update contains a rename for the conflicting files.

Hope this fixes all of you. It did me. Happy Gaming.