Pi-hole not accepting queries from Spectrum router

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Use the nslookup tool on a client PC (Windows/Linux/MacOS) to test connectivity:

nslookup <DOMAIN> <DNS_SERVER_IP_ADDRESS>

Eg:

C:\>nslookup pi.hole
Server:  ph5.dehakkelaar.nl
Address:  10.0.0.4

Name:    pi.hole
Address:  10.0.0.4

C:\>nslookup pi.hole 8.8.8.8
Server:  dns.google
Address:  8.8.8.8

*** dns.google can't find pi.hole: Non-existent domain

C:\>nslookup pi-hole.net 8.8.8.8
Server:  dns.google
Address:  8.8.8.8

Non-authoritative answer:
Name:    pi-hole.net
Address:  192.124.249.118

Maybe your router does rebind protection: