I have tried with Wi-Fi or 4G, And I get all the settings right but I couldn’t connect to any realm or server,I got this issue in multiple devices from tablet and phone on android,one way to solve this is to uninstall Minecraft and it will work at the first time, But later on if you turn off Minecraft , And turn it back on it won’t be able to connect to realm or other servers.

ps The first picture is from my tablet and the second picture is from my phone