diff --git a/internal/distro/rhel8/imagetype.go b/internal/distro/rhel8/imagetype.go
index 833ef0595..13c968c80 100644
--- a/internal/distro/rhel8/imagetype.go
+++ b/internal/distro/rhel8/imagetype.go
@@ -364,7 +364,7 @@ func (t *imageType) checkOptions(customizations *blueprint.Customizations, optio
 		}
 
 		if t.name == "edge-simplified-installer" {
-			allowed := []string{"InstallationDevice", "FDO"}
+			allowed := []string{"InstallationDevice", "FDO", "User", "Group"}
 			if err := customizations.CheckAllowed(allowed...); err != nil {
 				return fmt.Errorf("unsupported blueprint customizations found for boot ISO image type %q: (allowed: %s)", t.name, strings.Join(allowed, ", "))
 			}
diff --git a/internal/distro/rhel9/imagetype.go b/internal/distro/rhel9/imagetype.go
index c5654c1a2..352f05659 100644
--- a/internal/distro/rhel9/imagetype.go
+++ b/internal/distro/rhel9/imagetype.go
@@ -333,7 +333,7 @@ func (t *imageType) checkOptions(customizations *blueprint.Customizations, optio
 		}
 
 		if t.name == "edge-simplified-installer" {
-			allowed := []string{"InstallationDevice", "FDO", "Ignition", "Kernel"}
+			allowed := []string{"InstallationDevice", "FDO", "Ignition", "Kernel", "User", "Group"}
 			if err := customizations.CheckAllowed(allowed...); err != nil {
 				return fmt.Errorf("unsupported blueprint customizations found for boot ISO image type %q: (allowed: %s)", t.name, strings.Join(allowed, ", "))
 			}