Doesn't work multiple system

I opened the server to play multiplayer with my friends, but they said my server doesn't work on their screens As an example, I'll post a picture of my friend's screen my Minecraft  gamer tag is Kreuger7198, At that time, I opened the server and asked my friend to take a picture to see if I could see the server, but as you can see, my server was not visible I've tried a lot, but I think it's a Minecraft bug, so I upload it If it's a bug, please fix it

I deleted someone else's gamer tag and real names