A man tried to get into the Stamford Plaza quarantine facility twice in one day.
Joint head of Managed Isolation and Quarantine (MIQ) Megan Main says the man claimed to be wanting to see a friend and did not know it was a managed isolation facility.
On August 21, the man first entered the resident carpark within the same hotel complex, which is not patrolled because it is a separate residents' area.
The man then got into the facility through an emergency access panel.
"Once they entered this door, they were immediately stopped by a MIQ staff member," Main said.