diff --git a/app/api/calendars/route.ts b/app/api/calendars/route.ts
index 52dcff0..6fe8b8d 100644
--- a/app/api/calendars/route.ts
+++ b/app/api/calendars/route.ts
@@ -146,6 +146,17 @@ export async function GET(req: NextRequest) {
                   include: {
                     missionUsers: true
                   }
+                },
+                syncConfig: {
+                  include: {
+                    mailCredential: {
+                      select: {
+                        id: true,
+                        email: true,
+                        display_name: true,
+                      }
+                    }
+                  }
                 }
               }
             }