WCAG - How to make the screen reader read all the page automatically?

I need to have a screen in my app which all of it's content will be read using the screen reader automatically.

I tried to add role="dialog" aria-live="assertive" aria-atomic="true" and it didn't make it.

I also tried to use role="alert" aria-live="assertive" aria-atomic="true" it did read it, but using 'alert' as prefix.

How can I make it happened using no prefixes and additional info ?