Did you get this figured out? The issue is that you don't have the right credentials for the forge user. First, check to ensure you are actually using the env variables in you app/config/database.php file. Here's mine as an example (ignore the options line as that's specific to my app). Also, see my comment for DB_PASSWORD:
'mysql' => [
'driver' => 'mysql',
'host' => env('DB_HOST', 'localhost'),
'database' => env('DB_DATABASE', 'forge'),
'username' => env('DB_USERNAME', 'forge'),
'password' => env('DB_PASSWORD', ''), //<- is this your problem? The second param is the default if no env variable is set
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => '',
'strict' => false,
'options' => [PDO::MYSQL_ATTR_LOCAL_INFILE => true],
],
If that's all good, post the DB_ portion of your .env here -- just subsittute phony info for your real credentials exactly as you have tem in your .env file. Again, here's mine with dummy credentials:
DB_CONNECTION=mysql
DB_HOST=localhost
DB_DATABASE=myappsdb
DB_USERNAME=forge
DB_PASSWORD=myappspassword