Qwant has been blocking access from countries that have non-European languages ​​as their official language since around 2020.
It is still not available in Japan and other countries.

XユーザーのQwantさん: 「Some of you have reported difficulties using Qwant in several countries around the world. It is a difficult decision but we have decided to close access to our services in certain countries where we don’t believe to provide the expected quality of service. Our apologies for this.」 / X

I recommend using Stract and Mojeek, which builds its own index independently without relying on Bing or similar services.

EDIT: Add mojeek.