That is some pretty tough english might wanna make it easier by switching to English text for a bit if at all possible before screenshot.
If you used hashed passwords I want to say those are not recoverable but if you use plain text it is if I remember right when you go through the setup it explains this a bit. But I want to say I’ve had a similar issue before and I changed my user password or something along those lines it was an odd one I don’t recall the exact steps I took to get things working I think I changed my login then changed the DB password and reinstalled roundcube or something along those lines.
The screenshot has been changed to the English version.
I will upload it.
Although a password is not set when adding a new user, it is possible to create a user.
The problem can be resolved by editing the added user and changing the password again.
If possible, I would like to set a password when adding a new user.