In Shopware Admin, Shopware Account "Unauthorized The taken action is unauthorized"

I just finished installing Shopware 6 to my local windows machine using Symfony CLI.

When I access http://localhost:8000/admin, there is a popup of Shopware Account in white background, and I cannot close it, therefore I have to fill it.

However, when I come to the step of Verify your domain and click “next“, it always returns “Unauthorized

The taken action is unauthorized“

I searched online, people say it is because the credentials for Shopware Account is wrong or the domain is registered.

For my case, the login credentials are correct. And currently I don’t need a domain as it is in development stage, therefore I just searched a domain that is available in name.com and fill in as it is.

Others say I can just skip the step and restart by Settings>System>First-run wizard.

Unfortunately, there is no X icon, and I cannot close this popup, so I cannot access something like Settings.

I want to upload some products and update the category in the admin dashboard, and see what happens in the frontend.

As the popup is always there, I really cannot do anything.

How can I solve this?

Thanks!