Unable to connect to your database server using the provided settings.

The reason is right there on the second line: Unable to connect to your database server using the provided settings.
Try connecting to your database with something like PhpMyAdmin, using the same user/password you have in your configuration.
The database may be unavailable at the moment (down), maybe the password has expired and you are required to change it. There may be several reasons for this to happen.

CodeIgniter 4 tutorials (EN/FR) - https://includebeer.com
/*** NO support in private message - Use the forum! ***/