There are several things people do at their router that can prevent setup of IoT devices (MAC filtering, DHCP address limits, etc). This was written for the old Plug, but most of it still applies. Give it a look and see if anything applies to you:
There are several things people do at their router that can prevent setup of IoT devices (MAC filtering, DHCP address limits, etc). This was written for the old Plug, but most of it still applies. Give it a look and see if anything applies to you: