Description/background

I had set up a script which opened a Google site of our company in Google Chrome (not headless) and did some automated work on that page. The login information had to be refreshed occasionally what for I manually logged in. That had been working perfectly the last couple of months until last week. Today I noticed that I get the above mentioned error message as a result of a server response with HTTP status 400 upon entering my Gmail address and clicking the Next button.

Steps to reproduce

Puppeteer version: 2.0.0
Platform / OS version: Windows 10
URLs (if applicable): https://sites.google.com/...
Node.js version: v12.13.0

What steps will reproduce the problem?

1. Run a Puppeteer script to open a Google Site which requires login.

   (async () => {
   try {
   const browser = await puppeteer.launch({headless: false, userDataDir: "<ProfileDirectory>"});
   const pageLogin = await browser.newPage();
   await pageLogin.goto('https://sites.google.com/...', {waitUntil: 'networkidle2'});
   ...
   await browser.close();
   }
   catch (error) {
   console.log(error.stacktrace);
   }
   })();
   

2. Manually enter Gmail address and click Next.

3. Get error message "Sorry, something went wrong there. Try again." as a result of a server response with HTTP status code 400.

Update:

Manually opening Chrome (same userDataDir) and the respective Google site still works as usual.