why i cant deploy my application angular 12 in github pages?

I finished my angular application, and now I want to deploy it in github page, I run the following cmd:

1. $npm i -g angular-cli-ghpages to install githup page.

2. $ng build --prod --base-href="https://najib132.githup.io/appangular/"

3. I created an appangular repository.

4. $git remote add origin https://github.com/najib132/appangular.git

5. $git push origin master

6. $ngh

and when I enter on link it gives me 404 file not found