Turns out I have three zones, Main, Zone2, HDZone
Zone 2 of most receivers does not support digital audio. This is why your AV guy plugged in the TV audio using red/white analog audio connections.
I I do think i recall reading that it is analog only for Zone 2.
To get zone 2 audio from a HDMI only source you will need to use a HDMI audio extractor and plug in the audio via red/white RCA connections.
There are tons on Amazon and are under $20 for a 1080p compliant model.
Set the dip switch on it to 2-channel so it lets the source (Firestick) know that you need stereo audio, and the RCA outputs of the audio extractor will be connected to your receiver and will allow it to play audio to the patio speakers.
This this is where I start to get a little confused. every connection on the back of the projector I assume is an audio / video IN, correct? So I think I understand what you're saying though about an audio extractor. That is only going to take the audio source of whatever I have plugged into it out to the speakers. How do I get the video outside to the projector? For my current setup, the TV is my video and I'm just taking the analog RCA back to the receiver via the coax.
Welcome to the TOP reason why I think HDMI sucks.