Australia is a big, really big, sprawling country, and as a consequence there's a lot of places you don't get mobile coverage.
Sometimes you can get a wifi connection because the local pub has satellite wifi.
If it's Starlink, it's usually not too bad, and wifi calling and text messages can get through.
If however, it's the NBN's aging SkyMuster, or some other solution it can be too slow for wifi calling, and guess what, text messages sometimes don't arrive.
I'm talking seriously slow, the sort of speeds that make you long for character mode email and text based web browsing.
Really frustrating.
And of course you can't then complete the authentication process.
And Google's 'check your other device' solution can be just as bad, especially when you don't actually have your other device to hand, like it's a couple of hundred kilometres away.
The solution, of course, is to do all your set up somewhere with white lines and traffic lights before you go bush and making sure you click the 'remember me' box if there is one.
Of course, you don't always remember...