EDIT (see here *)

I wrote this simple auto login Tampermonkey script for https://app.7mind.de/login

// ==UserScript==
// @name         7Mind User Login Website
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://app.7mind.de/*
// ==/UserScript== 

let emailAddress = document.getElementsByName('email');
emailAddress[1].value = "x@y"
let password = document.getElementsByName('password');
password[1].value = "pass"
let loginButton = document.getElementsByName('submit');
loginButton[0].click();

I am getting this error in the console in Chrome:

POST https://api.7mind.de/v1/login 404

Grabbing the login button by class also doesn't work - same error.

let loginButton = document.getElementsByClassName("_2N3ybblop__YQd82Xe-Uw1");

As for the page's behaviour, I don't see my credentials getting inserted on the website.

*Also, when I leave out loginButton[0].click(), the credentials are inserted, but the same error occurs when I then click manually on login.

However, from what I read on the net, such simple login scripts should work.

Is this some recent Chrome security feature blocking my login attempt?