Sorry, not sure about this! Have you tried again recently? It should work on any browser including Brave. Also there is the MyCloudWallet app in the App Store / Play Store?

also could try again on the main https://www.mycloudwallet.com link; perhaps the referral link on the form is bugged?

Thank you for the effort!! You don't need a wallet to participate at the event, but there are lots of WAX NFTs you can receive for free if you had one. :)