RetireJapan

Has anyone who has set up IBLLC an account through the Interactive Brokers Japan site been able to designate a beneficiary/transfer on death? I have found info through the main US site on how to do so, but using that listed process doesn't seem possible on the Japanese portal (the option doesn't appear for me.) Specifically I, as an American, would want to make sure my investments/dough gets passed on to my Japanese spouse with as little hassle as possible should the unthinkable happen. Just looking for any advice here before I contact IBKR directly.