Find my iPhone

I don’t speak thst language to understand the last graphic.

You should be using the share location with people facility, you send him an invitation via the app, he accepts, that should work in most western countries. Your country, I have no idea.

Contact your local Apple Support directly. Depending on your region, you may be able to reach them here:contact Apple Support 

Of course if he has no signal or is on airplane mode I don’t think it will display. I have assumed all along that this is a technical query, not an urgent situation.. Try to call to see if he is still online

Should you not be on the people tab to find shared people?

Or is his phone a trusted device on your account ?

Are either of you on Low Power Mode?

Did he turn it off?