Now what magic did you perform T10? I got the collection edition and I got it from Microsoft Store. What the hell did you mess this time?
Are you only playing it on a PC?
Yes: the only consolle at home is the PS5 of my daughter. All was working fine until yesterday
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Ok maybe sign out of the Windows Store and sign back in, sometimes if you have multiple accounts and Windows is logged in under a different name it can throw up issues, it shouldn’t because the xbox app will ask but still sometimes does
Also if you use the xbox app to run the game do the same steps
There’s also a couple of programs MS have to repair the store along with the xbox app, search for them if you still have issues
Still not working and the fun thing is that all the optional content is signed as already buyed in the MS Store. BTW Forza Horizon 5 is not giving me any kind of problems with the additional contents and cars packs.
So they really took your money and ran 
You’ll have to open a ticket with support unfortunately and get ready for the robotic comms
Done 
and I bet my a*s they’ll take forever and more to find a solution. I alrady sended the pic of the proof that I own all the contents so far released for the game. Let’s see if they can fix it.
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Yep, you have to keep trying or just relaunch the game.
Happened to me too on Xbox SX.
Same Problem. I got the free Porsche 963 Pack from the Store and can’t use it any longer with the same error message. Console is a Series S and i’m logged in the Store already. Content was shown as bought in the Store.
@here
If you are still having issues with DLC you purchased, can you try working through the troubleshooting in this article first.
There is also an option to open a ticket at the top of the page.
Thanks @JetPartySalad
For me, it just worked when I relaunched the game.
Sorry, this is off topic: will the team do away with the FOMO mechanics please and allow us to win or buy all those cars?