Can’t Add multiroom music speakers to pair of echos on Orbi network

[wtoles]

I am unable to add my Amazon Echo devices to a multi-room music group.  I can see them all, but when I select one the other's are grayed out.  This happened after I applied the latest firmware update.  

[FURRYe38]

Has a factory reset and setup from scratch on the Orbi system been performed? 

Might contact Amazon support for help and information about there Echos and configuration there of.