How can I purchase Forza Horizon 3 expansion pass.

Credit to AR12 Gaming for bringing it to my attention:

Article Link:
ar12gaming.com/.../forza-horizon-3-expansion-pass

Hey there spencervdp.

If you purchase Forza Horizon 3 with the expansion pass, you should have access to all additional content

Hi,

To gain a better understanding of your concern, we need the following details:

1. Are you signed in with the Microsoft account that was used to purchase the game?

2. Have you tried purchasing the said item on a different console with your Microsoft account logged in and check if the same instance occurs?

With your Microsoft account logged in, click this
link and try to purchase Forza Horizon 3 Expansion Pass and check if the same instance occurs.

Keep us posted.

After some further Googling, I have found the follwing at
news.xbox.com/.../gets-hands-forza-horizon-3-today-ultimate-edition-early-access so as official as it comes!

We also want to let fans know that we will be offering a Forza Horizon 3 Expansion Pass for $34.99. The pass includes two expansions with the first being released this holiday and Ultimate Edition owners will receive a discount of $10 if purchased before
the end of 2016. Stay tuned for more details in the near future.

Read more at
news.xbox.com/.../gets-hands-forza-horizon-3-today-ultimate-edition-early-access

So for anybody wondering like me, it is a separate purchase.

was it just hot wheels you purchased? that just an expansion for forza horizon 3 not its own game