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Maybe the cast receiver app on your Mi Box is out of date? You can try going here https://play.google.com/store/apps/details?id=com.google.android.apps.mediashell&hl=en and see if you can send the app to your Mi Box to update to the latest version.
On my Shield, the cast receiver app is running v 1.21.75534
If that doesn't work, maybe try going to Settings -> Apps -> System Apps -> Google Cast Receiver and check to make sure it is enabled. If it is, try disabling it and re-enabling it or something.
Good luck
OP, it's not you, it's the MiBox. Mine has never worked for casting, although my Nexus Player works just fine. There's no amount of updating or tweaking you can do to make it work. I've tried everything.
Install the browser extension.
The same way you would cast from the Chrome browser to a Chromecast:
https://support.google.com/googlecast/answer/3228332?hl=en
You mean Chrome on your laptop/desktop, right? Because you can't cast from Chrome browser for Android the usual way. You'd need to do a screen mirror.