In the old interface, if I wanted to redeem reward points for a gift card, I needed to enter my phone number and a verification code sent to that number.
But since updating to the new interface, I can no longer redeem rewards at all. Even though I've granted Location permissions on my browser, I still receive the following error when trying to redeem points:

Couldn't complete your order
We are unable to validate your location using geolocation verification. Please re-submit your order and try again. If the issue persists, contact customer support.
I sent numerous support requests to customer support and received only generic (like a robot's) responses: We cannot verify your location and some reasons for the restrictions on earning and redeeming points.
I also told them that I'm from Vietnam and not using a VPN / proxy to log in, earn points, or redeem points; all points I receive are earned through actual searches and task completion. I also allowed them to check my login, point earning, and redemption history to verify that I was indeed logging in, earning points, and redeeming points from Vietnam. But all my responses went to "the Void," with no further response from customer support.
To ensure my account wasn't blocked/disabled/suspended from redeeming points, I tried making a donation, and the donation was successful without any errors or restrictions.

After that, I tried redeeming points on the Bing app on Android and received a message requesting identity verification via phone number as follows:

But after I entered my phone number (a real phone number, not a VoIP one, from the Vietnamese Mobifone network, and also the number I used to verify when redeeming points on the old interface), I received an error message: We don't support that country code. Use an email instead.

The same error also appeared when I tried it on a web browser.
Please check and fix this error as soon as possible.
Best regards.