That is for sure a scam. If it doesn't end in
.gov. au, they are trying to scam you

Caller: It was a text

Recieved a wierd looking text from this number saying there’s a new message in my mygov inbox, and the link is my-gov-inboxalert.com, just unsure if it’s real or a scam. Doesn’t look right, and it’s coming from a random mobile number seemingly not connected to mygov