If you use Apple Business Manager, please install MySOS normal mode first from the App Store or Apple Business Manager. And then please convert to MySOS quarantine mode by reading the exclusive OR code or URL which is presented by the Health Monitoring Center for Overseas Entrants (HCO).
Please follow the steps below.
1.Visit this HCO website. URL: https://www.hco.mhlw.go.jp/manual/en.php
2.Tap “summary” under the “PDF Manual”.
3.Install MySOS from the exclusive QR code or URL which is shown on PDF page 2, Health and Location Monitoring App (MySOS).