Can't connect to server after reinstalling Hydrogen App

[luuquatin6597]

I uninstalled Hydrogen and then reinstalled it.
I revised PUBLIC_STOREFRONT_API_TOKEN with the new token after installing the app.
Then I connected Hydrogen to github.
I reviewed and noticed 2 issues:

1. When you can move to the main domain
   => Even though I have set up the Hydrogen environment in the main domain, when I check, I see it jumps to the domain .myshopify.com

2. Cannot call server
   => Currently I can't call the API, all show error 500 Internal Server Error.

I don't know what the cause is.
Can you help me with the steps to check the issues above?

Thank you very much