I'm having the same problem, but on both the app AND webpage. Called them today during biz hours, they said it was a security issue and they couldn't change it, that it could be on the sellers end. So I try yet another seller, also in Japan, returns the same loop of security check, 6 digit code, then back to security check prompt for sending a 6 digit code. I literally have lost out of 3 different items I wanted today as Natural Japanese Sharpening stones for swords are very quick sellers.
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