So are you having trouble logging into the App or setting up the remote to control your Playbar? You  must resolve the App issue first.

Are you using S1 or S2 on your PLAYBAR? 

What error is the controller giving you when you attempt to log in? Many have run into slight misspellings in the account name when trying to log in, or using emails that don’t actually have accounts set up on. 

Have you called Sonos Support to discuss it?

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

I am having trouble logging into the app. I just bought the playbar from my neighbor, and I am trying to set it up from scratch. The app won't allow me to log in. When I click log in I never get to the log in page just keeps going back to the log in button in the app.

Sadly, you haven’t answered any of my questions. 

Initially, I’d start by a full factory reset of the PLAYBAR, in case your neighbor didn’t do so. If you’ve not yet set up an account, you may need to go to www.sonos.com and set one up, although generally the app, when it’s working properly (and JavaScript is turned on) should direct you to set up an account. 

I’d still call Sonos Support to discuss it.

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

OK...thanks for the info. Try this…

• Unplug the Playbar
• Unplug your router for 30 seconds
• Plugin your router let it come back and check for updates if you can
• Delete the Sonos App
• Connect your Android to Wi-Fi and check it for updates
• Plug in the Playbar...The LED should blink Green; if it isn’t factory reset it
• Download the Sonos App *
• Select Create a new system
• Follow the prompts

 * This assumes the Playbar has been factory reset to work with the Sonos App and not relegated to S1 only.

EDIT:

If you have difficulty setting up the Playbar you may have to connect it via Ethernet cable directly to your router. Once setup you can remove the cable.

I have performed a factory reset of the playbar.

I have unplugged and reset my router(s).

I have unplgudded the Playbar

I have deleted the sonos app. 

I have plugged the router back in after waiting 30 seconds or more

I am using TP Link deco mesh internet system.  I am currently hard wired to one of the decos.  

Could this be the problem?

I have downloaded the Sonos app, I do not see an app listed as Sonos S2, so I download the Sonos app.  When I folow the prompts, this is what happens:

get started with setup
speaker or component
headphones
join existing system

I choose speaker or component, 
terms of use, license aggreement, clicked accept

app takes me back to the Get started with setup page, if I choose speaker or component, the app takes me back to this page endlessly

if I choose join existing system
takes me to page allow sonos to use bluetooth
continue
allow sonos to find connect to and determine relative position of nearby devices
allow
allow sonos to use your location
continue
allow sonos to access this device's location?
while using the app
turn on notifications
continue / allow
searching for sonos
can't find a sonos system...
done

Account
sign in
unable to sign in. connect to the internet and try again.  This does this endlessly, the sign in page never appears
If I go to settings, the "add your playbar estimated time..." shows up under the sign in.  
If I click that, the app says connect to the internet and try again
under that
Not connected - your system not found on the network (playbar hard wired to router)

If I go to "switch system"  +set up a new system
If I tap that, unable to sign in. connect to the internet and try again.  
 

I have not called sonos but I will give them a call tomorrow.  Thanks for the help.

You can still call Sonos tech support but your statement that you have reset your ROUTERS (plural) leads me to believe you have two networks hence you are getting the warning “connect to the Internet” as your devices are most likely jumping between nodes.

You say you have a TP Link Deco mesh. I’d guess your nodes are generating IP Addresses and your device is connecting to another node. Only your main node of the TP Link Deco mesh should have DHCP capability to assign IP addresses. Also, if you are still using a router provided by your ISP it needs to be placed in Bridge mode, if you cannot turn off its Wi-Fi. 

Also when wiring a Sonos speaker during setup it should be wired to the main node (router) in the mesh; not one of the extenders.

So my conclusion is that your network is not properly configured. To further clarify a misconfigured network can go undetected by other Wi-Fi devices such as your Android as it doesn’t care from where it connects to the outside. However, a misconfigured network is problematic for Sonos.

Ok interesting, thank you. I'll give it a shot