How do I verify my identity without using bing on microsoft rewards?

I got into my Microsoft rewards account (the one with the points) and tried to buy a gift card. I have enough points, and it told me to verify via bing or phone number (Not email) I don't have access to bing, and when I try to use it using my phone number, it just says "Phone verification is currently not available." What am I doing wrong? I tried using incognito but that still doesnt work.