Problem with Forzathon shop / Forza Horizon 5

I cant use the auction house

Your playlist is not displaying the correct one as directly to the right of the forzathon shop should be a Horizon Arcade one...and the Forzathon Shop should have a picture of the Ferrari FXX-K.





Check what points are showing for already completed as, at a guess, you are on the back-up playlist which appears when there are issues connecting to the server.

Of course, now we need to investigate what the cause is.

Can you use the Auction House and enter Horizon Open (online) races?

And playground started asking to the community cars to be released through Forzathon shop like a "Community Choice", but here is only support forums. For that you will need to access Forza
Horizon 4 Official Forums

Forza Horizon 4 becsuse landscapes, music, cars, seasonal events with the forzathon live, it was a great combination

Eligible players will receive codes to download the Warthog via an Xbox Live Message, and codes will begin to be sent out during the week of Sept. 5. In addition, players who have not played an Xbox One Halo game will still have the chance to earn the Warthog
via a special #Forzathon event coming to Forza Horizon 3 in October.

For more info:
news.xbox.com/.../forza-horizon-3-gone-gold-halo-warthog-announcement