I also got this email. I saw it as an advertising stunt (a paid marketing ploy) for a game and nothing else. Proabably of no value to me as I am not interested in another game. So I did not even try to redeem it.
If you succeed in getting this perk, please share how you like it.
You can also submit a ticket in the Scrabble GO app by going to your profile, clicking on the setting/gear icon and selecting “contact” in front of Contact Customer Service.
Please note that this offer can only be redeemed on mobile devices and is not available through desktop.
I’ll mark my reply as the solution so it’s more visible to other Local Guides who might be experiencing the same. Thank you!