The Department has provided information for the holders of skilled and business visas who were offshore at the time of grant and are subject to Condition 8504 ‘must enter before a specified date’.Skilled Migration is aware that in certain circumstances the visa holder and/or family members may not be able to comply with this condition. Failure to comply with visa conditions can render a visa liable for cancellation under the Migration Act 1958 and visa holders are strongly encouraged to make their first entry to Australia by the initial entry date provided in your grant notification.

However, generally the Department will not seek to cancel a Skilled visa where the only reason for doing so would be breach of this condition related to the COVID-19 Pandemic.
This information applies to the following visa subclasses:
• Skilled Independent (subclass 189)
• Skilled Nominated (subclass 190)
• Skilled Regional (subclass 489)
• Skilled Work Regional (subclass 491)

https://covid19.homeaffairs.gov.au/