The O/P apparently doesn't wish to show the chords
I literally LOL'd at that. Anyway...
The message is quite straightforward to replicate, especially if one does not understand or is unwilling to study/understand music theory.
It is possible to generate fun puzzles, at least that are puzzling to me.
Here I have a piece that begins with D#, continues to F#, then ends on F.
I called it key of Em, BIAB wants to call it key of Bb.
Why???
I'm guessing it's calling D#/Eb = IV and F = V and ignoring the F#?