Two-factor authentication

Steps

enable debugging https://github.com/Ludy87/ecotrend-ista#debug

Go to https://ecotrend.ista.de/ and log in. After that, click on the menu, select "Benutzerkonto" and scroll down to "Zwei-Stufen-Authentifizierung" then click on "Hinzufügen"

Click on "Hat der Scan nicht funktioniert?" below the QR code

In step 2, the key will be displayed, which needs to be copied (it's best to write it down, as it will be required twice)

Now create an OTP sensor in Home-Assistant and restart Home-Assistant

https://www.home-assistant.io/integrations/otp#configuration

# Example configuration.yaml entry
sensor:
  - platform: otp
    token: KEY_FROM_ECOTREND

Write a name in the "Gerätename" before copying the code from the OTP sensor; then, paste the generated code (Note: the code is only valid for 30 seconds)

Now the integration can be set up

Enter the data

If something doesn't work, wait for 30 minutes before trying again - Ista has a brute force detection