Case Status Portfolio with Updates via Emailの段にある「Create/Edit customer portfolio account」 より、登録画面に入って下さい。
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Dear ****登録したID****,
Your User ID is ***登録したID****.
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Please save this e-mail for future reference. If you have further questions, please don't hesitate to contact us via the feedback link from our website.
Sincerely,
The U.S. Citizenship and Immigration Services (USCIS)