[php] laravel 5.5 The page has expired due to inactivity. Please refresh and try again

I know this question has been satisfactorily answered, but I wanted to mention a fix that worked in my case. I added {{ csrf_field() }} and it still didn't work.

Then I remembered that I blocked all cookies for development purposes, which can be nice when you change the page and want to refresh it.

Once I changed the settings to stop blocking all cookies in MS Edge browser the problem went away.