If using a voice assistant, like Amazon Alexa, then it might have been an Alexa alarm, or a reminder, rather than a Sonos alarm, perhaps?

Hey just bought sonos beam and I can't get any further with the app I get to where its supposed to play a chime passcode but no noise nothing any one no how to help 

If you continue, the setup should go onto request you enter the 8 digit (xxx-xx-xxx) pin-code located on the ‘serial number’ label on the rear of the device. It can be quite difficult to see the laser-etched code, so I suggest perhaps taking a photograph of the label with your mobile phone and zoom in to view it clearly.

Hi I can see it but never let's me put a code keeps going back and waiting for a chime code ? 

I think it goes through the chiming process a few times IIRC and then comes up with something like - “let’s try something else" … then it switches and asks the user to enter the code.

You could also perhaps try power-cycling the speaker and trying the setup again when you see the flashing green status LED.

I have tried everything very frustrating, keeps cycling chime pass, and will just keep doing over and over never offers an option for numbers under sonos bar tried factory reset, what is power cycling Ken cheers

I just meant powering ‘off’ the speaker for say 30 seconds or so and then back ‘on’ again, but I see now you will have already tried that if you have factory reset your device.

What mobile controller are you using for the setup and what OS is installed on the mobile? Also have you considered trying the setup whilst the device is temporarily cabled to the local router?

Hi Ken using Samsung galaxy s20 up to date on updates and also have it plugged in thorough Ethenet cable of that's any help cheers 

I don’t know @Barber68 it should be letting you step past the chime and inviting you to enter the pin code.

The only thing is to perhaps next contact/chat to Sonos Support Staff and see what they can suggest… you can contact them via this LINK