Nefit integration password change issue

Hi,

After changing all my passwords because after a known breach i wanted to change the Nefit password too. I setup the integration (Nefit Bosch integration) and can’t change the password in lovelace integration page. After searching in this forum i ended up changing my password in the core config file. After reboot hassio tells me wrong password. I deleted the nefit integration, rebooted and add it new. Even after entering the new info (serial, key and password) i get the same warning, wrong password.

Are passwords somewhere stored or cached?
What can i do to get this back working?

I’m a version before latest (after a new install yesterday and restore).