@Efour Copy that awaiting for there message.   

@Akuini 

The setting "Allow Guests to Access Each Other" is the only setting that I have in Access Point mode should affect isolation between clients. That setting is on the Guest Network tab in the Web UI or Tether app. Maybe it's accidentally affecting non-guest network access too?

I made sure that it was off (and toggled my 2.4GHz and 5 GHz guest networks on and off, and rebooted twice). My smart devices are able to talk to each other with firmware 1.1.0 now. 

The (only?) other odd thing about my network setup is that there is a wired network switch between my AX6000 and my internet router. 

@BusyWait I tried "Allow Guests to Access Each Other"  to have both enabled and disabled but during my test none will ping both ways.   the smart devices still functions i.e. my google speakers still answer queries independently because they all can still access the internet but they will not talk to each other.    the issue is the local network.  it is like 2.4 and 5GHz are on seperate VLAN.  they won't communicate I am still waiting for support if not I might play with the routing if I lost my patience waiting.

@BusyWait I was able to fix it myself as I lost patience waiting for support.  after troubleshooting for awhile, flashing the firmware, hard / soft factory reset and also tried to enable a bunch of features.  I determined it was an internal routing issue,  the fix is simply create a static route of your subnet to your router's IP as a gateway.  boom all is established all frequency can now talk.  I can cast to my tv's and all my smart speakers are talking to each other and can play music on my speaker group.  I hope this is informative and helpfull.

Note: make sure you create a backup of your router's config just incase you made a mistake.   good luck!

@Akuini is this still working for you ? 

@Headers  yup all is cheery!

@Akuini 

so to be clear, for me to do the same is the following correct my router IP address is 192.168.2.1 so:

Network Destination : 192.168.2.0

Sub Net Mask:255.255.255.0

Default Gateway :192.168.2.1

Interface: LAN

Is that correct ?

thanks 

@Headers correct 

Add me to the list on 1.1.0 Build 20200427 rel.80857 and 2.4 barely working. Sonos system is almost always offline now, can't connect some smart home products that are 2.4 only, and whenever our phones switch to 2.4, the connection is spotty.

We need an update like yesterday. Is there no way to rollback to the previous firmware? Is there a beta we can try? It's already been a week on this bad firmware. I don't want to wait longer.

@Efour got the same with Homepod end homekit product!

hope issue and corrective come soon