MyNumber & Temporarily Leaving Japan

I need to leave Japan for two years for work, with plans to come back.

What do I need to be aware of regarding MyNumber? I have a MyNumber number, but I never received a physical card.

Do I need to do anything prior to my move date? I wish to keep my Japanese bank and brokerage accounts open while I’m away for 2 years.

Many thanks to this community in advance for any guidance you can provide.

by housoukinshiyougo