How to add a new samsung connect pro as a extender sub hub?

[jkp]

check out this thread to see if it provides any answers:

Adding Samsung Connect home Pro to my existing Mesh Network

I just got another Samsung Connect Home Pro ET-WV530. I already own 3 of them and have it set up as a mesh network. One of the ET-WV530 is hard wired while the other 2 are meshed though Wireless. I try to set up this new one though the app and it won’t let me added to the existing Mesh. I can make another stand alone wireless network, but that is not I am trying to do. I would like to add it to my Mesh using Wireless. Any ideas? TIA