Work trip to two Australian clients - letters of invitation and visa extension

My friend is an Italian specialist who travels quite often for work; in April he'll have to go to Australia to fix a problem for Client A.

The client has sent him a Letter of Invitation that will allow him to apply for a work visa for the whole month.

Due to Covid restrictions, he'll have to quarantine for half of that time; this was accounted for, the problem of Client A can be fixed in the remaining time.

Now Client B, also Australian, wants to hire my friend for a couple of weeks in May.

A and B are not direct competitors, but A is not in the mood of doing any free favours to B, so they won't extend their Letter of Invitation to cover May too.

My friend can get a Letter of Invitation from B for the two weeks in May, but such a letter will include the date of entry - what would that date be? By the time the invitation from Client B comes into effect, he will have been in Australia for a full month!

Can Client B somehow extend the invitation of Client A, even if the two firms are not on speaking terms? Is there some other solution that does not involve exiting the country and doing another quarantine?

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Can an Australian tourist visa be extended?

You can apply for a new visa once you're abroad, but you can't extend your current visa.

Do I need a visa for a business trip to Australia?

Entry, Exit and Visa RequirementsMost U.S. passport holders traveling to Australia for tourism or business purposes for less than 90 days can obtain an (ETA). The ETA is an electronic label-free visa and can be obtained at the ETA website for a small service fee.

How do I write an invitation letter for Australian tourist visa?

Your letter must include the following information:

details about a person being invited. their first and last name. relationship to inviting person. ...

a reason for the visit.

duration of the visit.

details on how the person will support themselves while in Australia.

details about invitee. first and last name. date of birth.

Do you need an invitation letter to visit Australia?

An invitation letter for Australia is not obligatory for all of the visas. It's usually required for Australian temporary visit tourist visas, and even then it might not be a strict requirement. However, having an invitation letter will increase the chances of receiving a visa.

Difference Between Sponsorship and Invitation // Types of Invitation // 2020

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Dominika Roseclay, Tim Samuel, Tim Samuel, Tim Samuel