This did it for me, thank you!

Factory reset was what I was going to do to try to reset the baseline.  Encouraging to hear that may be a useful direction

Same i dont have such option to remove alexa...

Sorry, if you’ve tried these steps but it’s worth confirming.

If you open the Sonos App and click the gear wheel in the top righthand corner of the screen, then click  Manage next to you system name, then scroll down and select Voice Assistants.

Do you see Amazon Alexa listed?  If yes, please select it and if your device is not listed, then please select Add to another product and select the device you want to add Alexa to.

It's the weirdest and completely most bizarre fix but it worked for me. I had the exact same issue. I'm using an android phone, I uninstalled the Amazon shopping app. Then was able to activate the Alexa function with out issue. Then reinstalled the Amazon shopping app. I have no idea why it worked but I saw that few ppl on another chat tried solution and it worked. 

Thanks for the update, this is very useful information.

Factory reset worked as a fix on Sonos Move after trying almost everything else.

Yes but unsurprisingly they are extremely busy at the moment. I, and the other forum regulars, are trying to help.

The new software is complete garbage. I had to disable all voice assistance on my ARC. After new software update it just triggers off the TV audio constantly. 

THE NEW SOFTWARE IS COMPLETE CRAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Nope and I don't want to try it.

they say iOS app work but not android? are you using iOS @UKMedia ?

i’m on android, and i can’t make it to work. i already removed Alexa and re-added it. 

after re-adding, i get this message:

after clicking not now, Alexa still shows as added and available but voice commands are not recognized on sonos device.

i also tried relinking Sonos skill in Alexa app, but still no luck

Same i dont have such option to remove alexa...

Im having the same exact issue. 
 

I’m having the same issue with my Beam and One. Have deregistered both in Amazon.  Disabled skill. Deleted devices from Alexa. 
Switched both off. Deleted apps.  Rebooted router and phone. Reinstalled apps. Rejoined system on Sonos app. 
Relinked in Alexa app. 
In Manage devices voice assistant. Shows Alexa is already added still and cannot click on it. 
Spent hours on this and can’t get through to support.  
Was going up the wall. At least now I’ve found this thread I know I’m not alone!! 

All

I managed to get through to support. 
They said that Alexa not working is a “known issue” and we will have to wait for the fix to be released  

(The link to the “known issues” doesn’t seem to include this major bug though so when it will be fixed is anyone’s guess)

I see. The current Alexa issue is known at the moment due to the time and date not yet being fully integrated in the new Sonos app.

Just to circle back to this. I contacted phone support last night and as one of the troubleshooting steps, they had me perform a factory reset on my Sonos Arc. After that I was able to add Alexa again and now have it working again. Sucks that I had to factory reset though because I lost the TruePlay configuration and don't have easy access to an iOS device to set it up again since it doesn't work with Android.

I just got off the phone with Sonos tech support. After many troubleshooting steps were taken to get Alexa connected I was told that this is a known issue with the new app and developers are currently working on a fix with no ETA. 

Same issue here

This was on another post as a workaround. 

Having exact same issues.  

Having same issues.  Going to attempt factory reset.  

Worked.  2 One’s and 1 Beam.  

I’ve heard of this when someone has multiple Amazon accounts on a single phone.

I got a message from the Sonos App saying that one of my Sonos devices has no internet connection.  It’s odd as all of them are connected to Wi-Fi.

Hey, any luck resolving this? I have the same issue on all of my Alexa enabled Sonos devices

Hey. I managed to solve the issue.  It has been a long while. Here is how I did it. First, disable any current Voice assistant.  Then you should be given more choices for Voice Assistants.  You can now choose Alexa.  I hope it works.  Good luck!