If, for some reason, you can't use the online tool to set up and issue the ticket, then have the AA RTW desk set it up and then call AA in Tokyo to have it issued. AA RTW number is 1-800-247-3247. AA Tokyo number is +81 034 3337675.

We're currently in the middle of a DONE4 ex-NRT. I would have done it online (if the first flight had been on AA) but our first flight was on AY (to HEL) and I wanted to have it issued by AA (as it's easier to call AA if you subsequently need to change dates etc.). I had no issues with getting it issued (by phone) by AA in Tokyo.