I am having the same issue on a fresh install.php.
Entering my db info fails so I am required to add my db credentials in wp-config.php which allows me to the next screen.
When I fill in the username field – it returns the same form with the error-message: Please provide a valid username.
I am kicking off my install from a new IntelliJ IDEA PHP wordpress project using the PHP Web Server. I created a new ‘wordpress’ schema in MySQL Workbench. The user is root with all permissions.
I have scoured the web but, have not found an answer close to resolving this issue.
Any direction is appreciated.
This is a local install so, I cannot provide a link.
