Main landmark: <html lang="en-AU">

Hi there, I’m trying to get my website to be accessible and using a tool called axe DevTools v4.65.0

It has flagged that the website I’m publishing doesn’t have the Main landmark:

From my understanding, I have set this up correctly:

Any clues on how to fix it?

That does produce the correct lang attribute. A very simple test confirms this. Without knowing your website address it’s impossible to check. If you want to email us the project file we can take a look.