diff --git a/internal/services/privatedns/private_dns_a_record_resource.go b/internal/services/privatedns/private_dns_a_record_resource.go
index 999cff623e0b..b7702386be87 100644
--- a/internal/services/privatedns/private_dns_a_record_resource.go
+++ b/internal/services/privatedns/private_dns_a_record_resource.go
@@ -7,9 +7,9 @@ import (
 	"github.com/Azure/azure-sdk-for-go/services/privatedns/mgmt/2018-09-01/privatedns"
 	"github.com/hashicorp/terraform-provider-azurerm/helpers/azure"
 	"github.com/hashicorp/terraform-provider-azurerm/helpers/tf"
+	"github.com/hashicorp/terraform-provider-azurerm/helpers/validate"
 	"github.com/hashicorp/terraform-provider-azurerm/internal/clients"
 	"github.com/hashicorp/terraform-provider-azurerm/internal/services/privatedns/parse"
-	"github.com/hashicorp/terraform-provider-azurerm/internal/services/privatedns/validate"
 	"github.com/hashicorp/terraform-provider-azurerm/internal/tags"
 	"github.com/hashicorp/terraform-provider-azurerm/internal/tf/pluginsdk"
 	"github.com/hashicorp/terraform-provider-azurerm/internal/timeouts"
@@ -40,7 +40,7 @@ func resourcePrivateDnsARecord() *pluginsdk.Resource {
 				Required: true,
 				ForceNew: true,
 				// lower-cased due to the broken API https://github.com/Azure/azure-rest-api-specs/issues/6641
-				ValidateFunc: validate.PrivateDnsARecordName,
+				ValidateFunc: validate.LowerCasedString,
 			},
 
 			// TODO: make this case sensitive once the API's fixed https://github.com/Azure/azure-rest-api-specs/issues/6641
@@ -54,6 +54,7 @@ func resourcePrivateDnsARecord() *pluginsdk.Resource {
 			"records": {
 				Type:     pluginsdk.TypeSet,
 				Required: true,
+				MaxItems: 20,
 				Elem:     &pluginsdk.Schema{Type: pluginsdk.TypeString},
 				Set:      pluginsdk.HashString,
 			},
diff --git a/internal/services/privatedns/validate/private_dns_a_record_name.go b/internal/services/privatedns/validate/private_dns_a_record_name.go
deleted file mode 100644
index 77cb68f4ddd0..000000000000
--- a/internal/services/privatedns/validate/private_dns_a_record_name.go
+++ /dev/null
@@ -1,18 +0,0 @@
-package validate
-
-import (
-	"fmt"
-	"strings"
-
-	"github.com/hashicorp/terraform-provider-azurerm/helpers/validate"
-)
-
-func PrivateDnsARecordName(i interface{}, k string) (warnings []string, errors []error) {
-	validate.LowerCasedString(i, k)
-
-	if strings.ContainsAny(i.(string), "@") {
-		return nil, []error{fmt.Errorf("%q cannot contain @", k)}
-	}
-
-	return nil, nil
-}
diff --git a/internal/services/privatedns/validate/private_dns_a_record_name_test.go b/internal/services/privatedns/validate/private_dns_a_record_name_test.go
deleted file mode 100644
index d8998dda06e9..000000000000
--- a/internal/services/privatedns/validate/private_dns_a_record_name_test.go
+++ /dev/null
@@ -1,27 +0,0 @@
-package validate
-
-import "testing"
-
-func TestPrivateDnsARecordName(t *testing.T) {
-	cases := []struct {
-		Value    string
-		TestName string
-		ErrCount int
-	}{
-		{
-			Value:    "@",
-			TestName: "At",
-			ErrCount: 1,
-		},
-	}
-
-	for _, tc := range cases {
-		t.Run(tc.TestName, func(t *testing.T) {
-			_, errors := PrivateDnsARecordName(tc.Value, tc.TestName)
-
-			if len(errors) != tc.ErrCount {
-				t.Fatalf("Expected NoEmptyStrings to have %d not %d errors for %q", tc.ErrCount, len(errors), tc.TestName)
-			}
-		})
-	}
-}