Help! - Cannot connect new sub mini to exisiting set up...

Hi All,

Would appreciate some help please:

1. I’m not having any success adding a new sub mini to an existing beam 2.  The sub mini is not even being recognised by the new app.   Is the new app the problem ?
2. I’m also tried connecting the sub via an wired connection but still no success.
3. The Beam 2 is connected to the network via an ethernet connection.
4. When going through the new app; adding a new sub to the beam 2 option, the new sub is not coming up at all ; either wirelessly or through the wired connection. Only the existing subs are showing up.
5. I already have other sonos speakers and multiple subs in other groups which are all connected fine before the new app and after.
6. This is the first time I have had  trouble with the new app adding a new products.

Any thoughts or workarounds to get the working ?

Thanks.