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I have a Sonos system that includes:

Sonos Arc Ultra (TV Room)

Sonos Era 300 (connected under a separate room "Era 300")

Both:

Connected to the same Wi-Fi network, with a valid IP (Arc: 192.168.1.102, Era 300: 192.168.1.105)

With the same software version: S2 Version 85.0-64200

Show up on the same system in the app

The Era 300 is disconnected from any group or Stereo Pair, not in the same room as Arc, and ready to be paired

The problem:
When trying to set up surrounds on Arc Ultra, the Era 300 does not appear at all as an option to pair, even though everything is configured according to the instructions.

Steps I tried:

Factory Reset to Era 300 and re-add

Rename room

Disconnect from groups

Update version

Restart all speakers

One network, same frequency (2.4GHz)

You need two Era 300s to ‘bond’ to a Sonos HT - for left & right rear channels etc. you can’t add one Era 300 speaker only. You can though go onto ‘group’ (not bond, or pair) your speakers together as outlined in this Sonos support link:

https://support.sonos.com/en-us/article/group-and-ungroup-rooms

Note when a speaker is ‘grouped’ with a Sonos HT product and playing TV audio, there is a minimum of a 75ms delay in the audio output to the ‘grouped’ device(s) and it ‘may’ result in an echo if both players are in the same physical room. This only applies to TV audio, there is no latency when playing a music audio source, such as from a music source initiated from within the Sonos App.

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