A little more information would be helpful, but I can see from your profile that there are some speakers that are NOT compatible with the new app.

If you have updated to the new app the Play 5 Gen 1 will not be able to be used with the rest of the speakers in your system. Do you still use a Bridge? If yes, remove it and check to see if the speakers reappear.

If you still use the S1 app, can you hardwire the Playbar to your network? If not can you hardwire a speaker that is NOT a part of your home theater system?