hello guys...this error also happened to me 3 times...and I've found an alternative...so what I did basically was to load my square enix account with crysta using the same debit card that I used when i got those error 406...and suprisingly I didn't have any problems loading up crysta...and then I just used the crysta to pay for the automatic renewal...don't know if this will work for you guys but I guess its worth a try