Hi, thank you for reaching out to the Microsoft Q&A forum. I’m happy to help.
Based on the picture provided, it seems that you’re unable to redeem your Robux gift card due to a failed verification.
Try logging in and out of your account, and make sure you're not using a VPN. If the problem persists, please clear your browser’s cache and cookies, or try using a different browser or device to check again. You can also try again later, just in case it’s a temporary issue.
If all else fails, contacting the Rewards support team would be the best option. You can reach out to them using the following link: https://rewards.bing.com/support
The support team for Bing Rewards has the essential tools and resources to investigate and fix this issue. Please note that their response time is usually within 24 hours, but it may take longer depending on the volume of tickets they receive (first come, first served). Thank you.