No, you may not obtain it over the post office counter. Please obtain your Digital Address (JPN ver only) using the Japan Post Official App (JPN ver only) or the web browser.
* To obtain Digital Address, you must register to the Yu ID, and log in to the Digital Address for Japan Post Official App or the Digital Address for Web (JPN ver only) with your Yu ID
<Digital Address introduction site>
https://lp.da.pf.japanpost.jp
<Related questions>
Q. How do I obtain Digital Address (JPN ver only)?