My issue is SOLVED. The underlying issue was that my Stryd footpad was low on battery and was not pairing because the Stryd app essentially disabled it due to low battery. The reason I didn’t think the footpod itself was an issue is because one of the first things I did was to verify that my Garmin Forerunner watch was still capturing cadence from the footpod. Given that, I had not considered that there would be an issue with the footpod. (I also would have expected different feedback from the Zwift iOS app when the footpod was unpaired but I guess it couldn’t have done any. more than it did which was to tell me to try to wake up my device(s) and pair something.)
And, it wasn’t that my heart rate monitor wasn’t pairing – it’s just that the Zwift iOS app doesn’t even present an option to pair the HRM until you’ve first paired the run sensor.
After charging my footpod and pairing it via the Stryd iOS app, I was able to pair it in the Zwift iOS app without issue. And once that was paired, I was given the option to pair the HRM as well.