Ticket Pia question: Do you need to re-verify Japanese number every login?

I’m overseas but want to buy official Oasis resale tickets from Ticket Pia. You need a Japanese phone number to verify when signing up — I can do this in early September when I’m in Japan. But the resale starts Sept 25, when I won’t be there. For those with Ticket Pia accounts, do you need to verify your number every time you log in, or just at sign-up? Thanks!