What the Subclass 485 requires
The Temporary Graduate visa is for people who have recently graduated from an Australian institution. The central test is the Australian study requirement: your qualification must come from a CRICOS-registered course, taught in English, and completed over a minimum period of study in Australia. Courses completed largely online, or compressed below the minimum duration, can fail this test even when the degree itself is perfectly genuine.
You must also apply within a set window after your course completion date, hold an eligible visa at the time, and generally be in Australia when you apply. Missing the application window is one of the most common and least recoverable errors on this route.