diff --git a/main/docs/customize/custom-domains/multiple-custom-domains.mdx b/main/docs/customize/custom-domains/multiple-custom-domains.mdx
index 9897adacc..2c4f44e42 100644
--- a/main/docs/customize/custom-domains/multiple-custom-domains.mdx
+++ b/main/docs/customize/custom-domains/multiple-custom-domains.mdx
@@ -629,3 +629,4 @@ The following attributes are supported for Auth0-managed domains only:
 With MCD currently in Early Access (EA), we are aware of limitations to the functionality and existing feature set. Please see below for more information:
 
 	* The WebAuthn RPID is currently limited to a single domain configuration and is currently incompatible with customers using multiple custom domains.
+	* **Custom Domains with Classic MFA and Guardian**: When using multiple custom domains with Classic MFA or Guardian, the associated notifications always use (and default to) canonical domain.