[iDNS] Call out WARP Local Domain Fallback interference (#26343)

Author: RebeccaTamachiro

src/content/docs/dns/internal-dns/get-started.mdx

@@ -16,12 +16,17 @@ import {
 
 Follow this guide to get started with Internal DNS.
 
-## Before you begin
-
 <Render file="internal-dns-beta-note" product="dns" />
 
+## Before you begin
+
 - Make sure you have an Enterprise account with access to [Gateway resolver policies](/cloudflare-one/traffic-policies/resolver-policies/) and [Internal DNS](/dns/internal-dns/).
 - Consider the different ways in which you can [connect to Gateway resolver](/dns/internal-dns/connectivity/).
+
+  :::caution
+  If using WARP, make sure your internal DNS zones or their TLDs are not listed in your [Local Domain Fallback configuration](/cloudflare-one/team-and-resources/devices/warp/configure-warp/route-traffic/local-domains/). Otherwise, DNS queries for a matching domain will be sent to the local DNS server specified in the fallback, instead of being sent to Cloudflare.
+  :::
+
 - If you will be using an API token for authentication, make sure you have the following permissions:
 
 <Details header="API token configuration">