I am building a spring boot web application for flight booking. I have an index page, a registration page, a login page and a home page. I am facing two issues:

When I run the application, the default login page opens instead of the index page, even though I have enabled access to the index page without logging in. Below is the security configuration:
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And the registration controller:
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After logging in, the index page opens successfully, however, when I click on the ‘register’ button, it redirects to a white label error page. Similarly, I am not able to open the home page, and the custom login page (it redirects to the default login page provided by spring security).
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Please let me know if additional information is needed.