Session in CI 4 is not working accross the controller

I encountered this problem recently.
For me the reason was using hard-coded url: https://www.abcd.com. While the browser url was without “www” ie. https://abcd.com.
So instead of hard coded url, i used base_url( ) to generate the base-url automatically.
And that solved the session problem, and it is now working in all functions.