The read-only user was also removed with a "force password change" requirement.
This applies to all firmware versions from 09.1.00.
Updating from previous versions to 09.1.xx does not remove the read-only user but loading the factory settings from 09.1.xx does.
The JAVA web interface does not distinguish whether a read-only user exists or not and always shows the option of changing the password for the read-only user in the password dialog. A change in the web interface dialog is no longer planned for Classic Switches in this regard.
However, a read-only user can also be created manually in the CLI to avoid the error message.
(Hirschmann Railswitch) (Config)#users name user
(Hirschmann Railswitch) (Config)#users passwd user
Enter old password:
Enter new password:******
Confirm new password:******
Password Changed!
(Hirschmann Railswitch) (Config)#