This is a known issue when staff are accessing Options under MyEmail tab of HKU Portal if they are not using Microsoft browsers.
As a workaround, please use Microsoft Edge to access the MyEmail tab or access your email via https://hkucc1.hku.hk/owa.
Home > KB > Email & Communications > I received the alert “critical error” when accessing “Options” under MyEmail tab in HKU Portal. What should I do?
This is a known issue when staff are accessing Options under MyEmail tab of HKU Portal if they are not using Microsoft browsers.
As a workaround, please use Microsoft Edge to access the MyEmail tab or access your email via https://hkucc1.hku.hk/owa.