Samsung Radiant 360 Multiroom Wireless Audio won't connect

After "upgrading" to xfinity wi-fi router (latest model), I'm no longer able to connect my Samsung Radiant 360 Multiroom Wireless audio speakers to wifi.  So now I basically have 2 bluetooth speakers.  The speakers have an app that walks through setup. The app also provide a means for initiating streaming audio from a variety of services and local network music.  Howeve, after entering the password into the app, it comes back saying its unable to connect.  I've tried many things: change wifi name, use 2.5g and 5g separately, system resets for both the wifi and the speaker.  The only thing I haven't tried is just the wifi as an open network, but I don't care if that works, because I will not leave it that way.  The only difference from before is the xfinity router instead of my previous netgear unit.  I suspect this issue is specific to the samsung system.