Surround Speakers Fail to Connect at 4th and Inches

After multiple factory resets and attempting what I believe to be every permutation of setup possible, I'm unable to get two Play:1 speakers to successfully connect to a Playbar and complete the setup process. All devices (playbar, left surround, right surround) work independently of each other when configured using the Sonos controller and provided a source (e.g., music). The Play:1 devices will successfully connect to the controller and play music, but the moment you choose to bond them with the Playbar to create a theater surround solution they fail.

Here's a recap:
* The Playbar is connected wirelessly without issue
* The Left Surround successfully connects (wirelessly) to the playbar
* The Right surround successfully connects (wirelessly) to the playbar
* In the final step when the controller says it's working to get all devices communicating together, it fails and provides a "Setup Error" message.

Starting to get concerned there's a problem with the playbar.

Thanks for any help you can provide.

- Josh