See forum post: https://forum.mendix.com/link/questions/86572
The easiest way is to insert a HTMLSnippet, give the signin button class signin and use a little jQuery :
$(".otp input").keyup(function(event) {
if (event.keyCode === 13) {
$(".signin").click();
}
});
Allow anonymous users, create a custom sign-in page and replace the default sign-in widget with a call nanoflow button that triggers on-enter. Use the sign-in action from the nanoflow commons module to sign the user into your app.