This is what I have received from the support. Make sure of the highlighted points to be noted.
Hello V3onix,Thank you for contacting us! The 10-Year Anniversary Emblem and the Kyndryn Gunblade Skin will be sent to eligible players' inboxes after all the alerts conclude. In case you still do not receive the reward, kindly submit a follow-up so we can further look into this.We hope this information helps.Kind regards,Warframe Support Team