Not much to say for this one, nor any leads.
I went to report a player (IGN "Tilted") while in a match, but I got the popup saying I already reported them (see: https://i.gyazo.com/62e4ce1b14c0b244b8b ... 256e9b.png ).
However, I hadn't already reported them (or anyone else).
Here's a clip showing more: https://i.gyazo.com/462d341eec2260abf89 ... 985d6b.mp4 (edit: I can provide higher resolution video if needed)
Specifically of note is that there's no confirmation message of a report being filed.