Hi Javier!
No problem with verbosity, we have more information now.
But I must still keep asking the same question.
After apt-get install ivozprovider, some blue screens should appear during package configuration step.
MariaDB for example requests password and confirmation.
Ivozprovider package displays a menu, where some addresses can be configured and also, the database password (see attached image)
In that menu, you must configure the same password you used in MariaDB configuration screens.
Please confirm if the screens are being displayed and the setting is properly configured.
Regards!