Airgetlam is correct about adding surrounds to a PLAYBAR. It should appear as a stereo pair first and then you add to the PLAYBAR. If you are having a problem with the PLAY:1 not connecting for some reason, you could factory reset the "problematic" PLAY:1 to get it back to "square one" and then, set it up just like a new device. Then after following Bruce's steps, you should be able to get this set up rockin'.
If you run into any problems in the process, be sure to let us know where in the process you got caught up and, if possible,
submit a diagnostic report. Be sure to reply with the confirmation number it gives at the end. I can take a closer look and advise. Thanks!
Building community is like building a garden. You build the frame, till the ground, plant the seeds, feed the plants & sometimes you gotta pull the weeds.