Accidentally deleted the message with the warthog code for forza horizon 3.

i got a message for a warthog download in forza horizon 3 but accidently deleted it

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

Hey guys,

For information regarding how the Halo Warthog on Forza Horizon 3 codes are going out, please check out our
Warthog/Forza Horizon 3 Codes stickied post.

Thanks for understanding!

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Enjoy!

I had a message from Microsoft for a promotional code for the Halo Warthog as a download add on for Forza Horizon 3, but now the message is no longer there, nor did I ever delete it. I was going to buy the game, but wanted to install the add on first.
Is there any way to get the message with the code again?