Hi.  Can I confirm….. you are NOT saying that the source plays but the sync is out, but you are saying that you cannot GROUP the components?

Also

1. Can you see all the units in the app at the same time?
2. Are all the speakers connecting to the same WiFi band (2.4 or 5)?

Actually, don't do anything further until you have powered off your router and all Sonos, then powered them all back on again.

Hi John,

Thanx for swift return.

I cannot group the units and all the units play perfectly individually. The three Play units I can group, but I cannot add the Port. And when using the Port, I cannot add the Play units. Thanks for this clarifying question. 

I can see all my units in the app at the same time.

All speakers are connected to the (same) 2.4 band on the WiFi.

I have tried to start from scratch again, powering off everything, and systematically adding the units one by one - without solving the problem.

Best,
Peter

Although it seems an unlikely explanation, I have known this sort of problem caused by wireless interference. So my next suggestion is to try different channels on your router. For example, if currently set to 6, try it on 1 and 11. Might be worth powering off all Sonos then powering back just the Connect and one Play initially for troubleshooting.  Move the Play reasonably  close to the Connect, but no closer than 1 metre.

Please report back. 

Edit - you may also wish to try with the Play speaker about a metre from the router.

Thanks.

I do no have the option to change channel on my router - so it cannot be the source of the problem. Before the app was launched (in the spring) we had no issues grouping the units - which underlines that it cannot be the router that is the challenge.

I’ll try the phone support (Denmark) later today - and I’ll get back to you if they can identify why I have the issue.

Hi.  Then you have the only router I have ever come across that does not allow you to change the WiFi channel.  Even assuming that is so, your conclusion that that makes interference impossible is plainly false.  But I hope you find a solution through the phone support. 

The solution was quite simple. The unit wasn’t upgraded to the newest software. Where all units must have the same software if one wants to group them. Lessons learned. I like your comment regarding the router. It is my take that a router and e.g., the sonos system do not require special technical knowledge - and in my case I can only confirm that I should have added two and two together before contacting the support. To everybody who reads this: The units in the app are not automatically upgraded to the new software even if you have activated the button that says you want this.

It’s always helpful to see the solution to a problem so it’s great that you took the trouble to post back.  

Changing a router wireless channel may be necessary for optimal operation of your network - irrespective of Sonos -  and the simple steps involved will generally be set out in printed or online documentation for your router.  

I’m surprised that Sonos didn’t flag that you needed an update, but clearly it didn’t.  You can set Sonos to update automatically if you wish..

I’m pleased that you found the solution.

Thanks John for your advice on my router. I’ll look into it. /Br Peter