@Cyero no worries, and for "assigned type" have you tried "DHCPv6" instead of "SLAAC+RDNSS"?

@Cyero Just a thought, have you tried to change IPV6 internet settings "Get IPV6 address" from "auto" to "non address" to see if that makes a difference? Cheers

@David-TP Thank you, sorry think there is some confusion as this thread actually covers 2 issues now: 1) Unable to connet to Deco issue on App (my original post) - I'm aware the engineer could not...

@David-TP Any updates on what the engineers said please RE: the X75 Pro showing devices as wired or not showing at all on the Deco app? BTW I've changed my network back to my X60 as main DECO. Thanks

@TimmyC Who is your ISP? You mentioned a modem but is that a router or a modem/router? Depending on your setup you might be able to remove your ISP router but depends on ISP type and setup.

@TimmyC Have you tried a different ethernet cable between the ISP modem and your Main Deco? Cheers