Problem adding surrounds to Beam

Hi! Im having the same issue with my 2x Play:1’s and beam. 

My diagnostics number: 807155853.

Hi, I have exactly the same problem with the same setup (Beam and two Symfonisk). It worked perfectly when I bought these 2 years ago, but now nothing helps to make it work. I have tried to change wifi and other network setting, even hardware, but nothing helps. 
I think Sonos technicians need to take a look and provide a firmware update that solves this.

They’ve got no idea what’s “wrong” with your system, so it’s hard for them to provide a solution to you. Your best bet is to submit a system diagnostic within 10 minutes of reproducing this problem, and call Sonos Support to discuss it.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the phone folks, they have tools at their disposal that will allow them to give you advice specific to your Sonos system and network.

I know I’m a year late, but I’m having the exact same issue and cannot seem to resolve it with any of the troubleshooting methods listed in the thread. Also, I’m not seeing a “Diagnostic Number” anywhere, curious where this is found. If anyone has been able to sort out this issue, some guidance would be very much appreciated. 

A diagnostic confirmation number is displayed after you Submit a Diagnostic.

If you click on the underlined words in both my and @jgatie ’s posts, you’ll be taken to an FAQ that explains how to submit a diagnostic. 

I’m so fed up of having bought these products I wish I just wired up my speakers. my last stereo never needed any adjustment in 20 yrs. this stuff crashes every week. 

For those of you still having this issue, I found something that worked for me. When I added each of the speaker parts (an 'arc' and 2 'one SLs'), I assigned them to be located in the "Living Room". Each of them were assigned the same room location, but were numbered weirdly. The arc was in "Living Room 1", the two SLs were in "Living Room 2" and "3" respectively. I changed the rooms they were all assigned to just the "Den" (all matching names). Once I did this, all of a sudden it worked! I suspect when initially installing the speakers, the app must have assumed the parts were all in three different living rooms. Hope this works for someone.

I had this issue recently, which coincided with a new wifi 6e router from Vodafone. To fix it I had to go into the router settings and turn on compatibility mode, which splits out the 6e band from the 2.4/5GHz ones. Everything connects fine now, but was very frustrating trying to get it sorted!