Gs105 with Google Mesh

Hi 

I have seen very similar questions and close answers but cannot get my connections to work.

I have a Xfinity X1 modem - Google Mesh w/ 2 access points - Netgear GS105 setup.

I have the X1 modem in bridge mode allowing the Mesh to be my wifi with very fast speed. I am trying to run Arlo camera base unit and Western Digital MyFi external harddrive from the switch. Neither device can find a network. I have reset, unplugged everything multiple times and even went another round with Google support to no avail. Please help if you can! Thanks!