Up till now I've only used the kobo forma and smartphone, but I tried installing the Rakuten Kobo reader for PC, and was able to see my library and read books.
Only thing I can think of that might be relevant is that, before logging in, I set the reader's language to Japanese (from the Preferences option from the gear icon in the upper right) and then after that pushed the red 楽天Kobo button to log in.
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