G'day Pinky,
I can't say 'for sure' why that was the case, but can only guess that you were actually on an ATC freq addressing the call to 'Flightwatch', in which case, the ATCer (or 'es) would have answered your FW request 'when workload permits'.....
More important 'core business' first, and we all understand that.
The call on HF was, at that time, a dedicated 'FW' HF function at a separate console, I would imagine.
I am not 'current' on what it is these days.....
Perhaps one of our 'usual suspects' can answer that.
Cheers
PUT THAT 'RED' DOWN....YOU Don't know where its been.....