Unsure if Pihole+Unbound are blocking ads on iPhone

[deHakkelaar]

@Grady

Is this setup causing a loop and could that be what's creating these issues, even on a fresh install of Unbound?

It could be if you also configured the Pi-hole IP in the WAN/Internet DNS settings on the router which could close a loop or partial loop?
And does below file exists and if so, whats in it?

cat /etc/unbound/unbound.conf.d/resolvconf_resolvers.conf

Also I noticed your clients hostnames having the .local suffix domain name configured which is not recommended:

Questions about local hosts, local domains

Using .local as your local DNS domain name may work in your network, but I'd advise against using it in general, since .local is the default domain name used by mDNS, as implemented e.g. by Apple's Bonjour or Linux' avahi software (recent Windows and Android versions have mDNS support as well) This also means an mDNS-aware OS will be able to resolve .local domains regardless of any DNS server's presence, e.g. I can ping my RPi as raspberrypi.local though my local domain name is fritz.box (but c…

I see your router settings allow to configure a "Domain Name" suffix for the separate LAN segments.
I'dd suggest name them like below instead of localdomain (which isnt't gonna work properly anyway with CF "Conditional Forwarding" for all three segments):

lan.home.arpa.

iot.home.arpa.

adc.home.arpa.

So you're RFC complient

RFC 8375: Special-Use Domain 'home.arpa.'

I'dd suggest to get it working for your LAN segment only at first.
Configuring Pi-hole with CF for multiple domains on multiple network segments involves a bit of hacking and a better understanding.
You can learn allot if search Discourse here!

EDIT: And oc the docs:

Overview of Pi-hole - Pi-hole documentation