My CC has been failing to recognise some of my fuelling commands in iRacing. This began in test sessions a few weeks ago - some of the commands wouldn't be recognised at all (CC would recognise an input, but return the "I can't hear you" message), while others would be processed as #cleartires. I thought this was maybe due to the session type, so I ignored it at the time, especially as fuelling messages in race sessions were being recognised normally and correctly, at least after several attempts.
The issue then resurfaced on Saturday in a race session. It can be seen/heard in this recording: https://www.youtube.com/watch?v=9glGoszj24Y of my stream, at 42:28 - I attempted four messages of "Pitstop add 28 litres", with the "I can't hear you" message returned in response. I had to manually check the fuelling box in in-game controls at the last moment, with a resulting overfill.
Is this a known issue, and could it be caused by CC setting or something on my end (mic input level too low, etc)? I haven't yet encountered this problem with other messages, only with fuelling commands.