Alexa issues when switching wifi networks

Did you check that both the Home and Office WiFi credentials were stored in the Home System/App before you left for the Office.. Just use the "update network" feature in the App to ensure (double check) the WiFi credentials for the Office Sonos device are on that speaker before you leave Home (you only need to check that once only) - you definitely won’t ever need to create a new Sonos system/household when you get to the office - When you power on the speaker it will automatically connect to the office WiFi (that’s as long as you have entered/added the office WiFi credentials correctly to your home system) via the App.

Also ensure your mobile controller is connected to the office Wifi network. Then open the Home controller App and it will (should) see your speaker connected to the office wifi straight away. Make sure nothing on the office nerwork is blocking it from getting an IP address. 

You will find too that Alexa also works at both Home and Office, as they are the same Sonos Household (system), they’re just operating in two different locations, on different WiFi networks.. I use this setup all the time when travelling and it definitely works for me.

I did do the update network before leaving office and both networks were there. But… when I got home and checked only the home network appeared. I’m thinking it might be time to wipe everything and rebuild. 

Funnily enough, I'm away again now with my Roam and unable to add it to another WiFi network.  This was resolved in a previous software version.  It sees my Roam, asks for the new WiFi password, the light changes colour and it says it's adding it but then gives a ‘There was a problem connecting your Sonos Roam… ‘error.

I’ve just gone through the screens @sjw and it’s working okay here with the current S2 App v14.18.1.
 

I had no issues connecting & updating the network settings of a Roam and Sonos One (gen1) - if you get a failure to connect it’s worth sometimes power-cycling both the speaker and mobile controller device.

Once the network credentials have been added to a single chosen speaker in the current system, the below screen then pops-up to update the rest of the system speakers with the new network credentials too.

So any devices that need the new credentials need to be powered on aswell.

I get those screens but then an error.

If you recall it was a known issue (certain Android bbuil I think?) but resolved in 14.15 or 14.16. Hoping it hasn't broken again..

I did restart both the Roam and phone too.

Just to show it works in this current 14.18.1 build, I’ve just made up a WiFi network SSID name here called ‘sjw-network’ and was able to add it to the list of networks for the local system to use. I just added it to the one speaker (a Sonos One Gen-1).

See screenshot:

Here’s quite a useful tip (perhaps?) @sjw, and there are a couple of ways to achieve the same outcome. Anyhow, I will outline just the one here to avoid confusion, but it needs a second mobile device to assist with this.

If you’re away from the ‘new’ network (at Home for example) and cannot access it for some reason, you can quickly create a mobile hotspot with the same credentials as the new WiFi network (just as a temporary measure) and then setup a speaker on that temporary hotspot. Then when you arrive at the (new) location with a WiFi network that has those credentials, then all being well, the speaker will look through the list of added networks and will auto-connect to the remote WiFi destination when it is powered on and in range of the network.

Open the Sonos App on the same network and you should be able to see and control the Sonos speaker straight away.
 

If the speaker has a working Alexa installed, that will continue to work too, without having to remove the Sonos Skill.

Hope that helps.

What is the best way to completely delete and reset everything and start over from scratch? Having same problem as sjw where it won’t connect to the temporary network.