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I found that it is indeed Synology settings that were causing the problem. In the Web Station app in Synology, open the PHP settings for your preferred PHP version. There are extensions below, look for mysqli and select that. I did end up having to use the
localhost:/run/mysqld/mysqld10.sock
as the server to get it to run. Please let me know if this works for you too.
I too am running into this problem. I agree that it seems that the account isn’t connecting to the database. Apparently Maria DB doesn’t work with localhost, so one has to be explicit by putting in 127.0.0.1:3306 (or the port you have set for sql). Alternately I have found one that says you should use localhost:/run/mysqld/mysqld10.sock, yet both options aren’t working for me still.
As far as the user account goes, I have created a user who is able to log into PHPMyAdmin, yet when I put it in the wp-config.php file it doesn’t work. In PHPMyAdmin I see that the database doesn’t have any tables. If we can figure out why it isn’t talking with the database I think everything else would fall into place. fp7100, were you ever successful in getting it to connect through your FQDN?
