I got everything setup earlier, and it went off more or less as planned. It turns out, I don't even need to use the Sonos bridge anymore. It was doing a half-assed job of streaming lossless music to my Sonos speakers anyway, so really happy I no longer need to use it. I usually experienced buffering issues, resulting is lossless music cutting out.
The Sonos speakers are now wirelessly connected to the UniFi access point. I've been testing for most of the evening, and I'm not experiencing any of the previous issues during lossless music playback. Go forward, I just need to connect my Sonos speakers to the UniFi access point. Also, since I no longer need the Sonos bridge, I don't need to bother with using the eth1 port either.
The one thing I realized was, the ERP and UAP don't like connecting to devices with incorrect static network configs. I had some devices with static configs, and since the default gateway didn't match the one on the router, both the ERP and UAP choked up. I couldn't connect to the management console, but I could no longer connect to the internet.... go figure.
Anyway, once I figured things out, I was up and running in no time. Thanks again for your tips smax.