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I would add that this criterion for supporting NTP SI from different regions can be very tricky for users who set their Device Language very different than their native Region. Brave has been working on it for quite some time now- https://github.com/brave/brave-browser/issues/4174

However, in most cases there are some combinations of settings that work but these may not work all the time. Some progress here is needed. Link to original post- User Feedback - Recommendation - Don't Make Computer Language Synonymous with Region