Home Assistant Server not connecting to my Web Browser

Hi! I installed Home Assistant OS on my Raspberry Pi 3B, but it won't seem to connect when I type the URL in my Web Browser. It shows the URL and IP on the Raspberry Pi, but when I tried putting them in my web browser it didn't work. Is there anyone knowledgable of Home Assistant here that can help me?

Have you used http://YourRaspIP:8123 ?

So I found out the problem, but now I have a new problem. The server doesn't show up in the Companion App.

What was the problem, its a nice habit to tell that to the community.