Check the device and browser first
For unsupported-screen errors, the page recommends a desktop or tablet where the service is not mobile-optimised, or reducing device font and browser zoom settings. For page-display errors, try clearing relevant browser data or using private browsing, and check the published compatibility table. A pop-up error may arise when a service needs to open an external page. Permit the necessary official-site pop-up rather than assuming the transaction has failed permanently.
Distinguish access and technical support
IRAS also identifies incorrect device time, cached data and session conditions as possible login causes. Corppass permissions are handled separately from browser settings. When contacting IRAS, prepare the service name, device type, browser and operating-system versions, and the displayed message. The page provides live-chat and telephone support during its stated working hours. Browser versions and operating-system support change over time, so use the live compatibility table instead of treating old screenshots as permanent specifications.
Official source
A concise, independent Apex Gateway guide based on the official English source, not a reproduction of the complete document. Consult the original for full conditions, exceptions and subsequent updates.
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