JP post mail delivery issue

Hi everyone,

I live in a university dorm in Osaka with three different entrances. A while ago I moved rooms, and when I set up my water/electricity contracts I accidentally used the building number 2 instead of 3 (the room number is the same, just the entrance/building number is different).

Later I updated my address at city hall to the correct one (3), but Japan Post still delivers some mail only if it’s addressed to 2. For example, my electricity bills weren’t being delivered until I asked the company to switch my address back to 2. Packages from Amazon/Yamato are fine because the room number is unique, but official letters seem to get stuck.

Now I’m worried about important mail like health insurance slips, insurance cards, or bank documents—since my official address is 3 but JP Post only seems to recognize 2.

Does anyone know if it’s possible to register two addresses with Japan Post under the same name, so I don’t miss important mail?

Thanks!