Re: “Access denied for user” during install?
With integration, it’s easiest to use the same database, then just change the table prefix (or leave it at the default for bbpress – there’s no conflict.) If you use the same database, then just use the database connection details from wp-config.php.
It seems you can’t even SHOW TABLES, not even talking about creating anything yet. The permissions required to SHOW TABLES are much less than those needed to create a table.
Something weird is going on and we’re going to smack our heads when we realize how simple it really was.