maybe??

src/routes/dashboard.js

@@ -317,9 +317,9 @@ export const dashboardRoutes = (fastify, _, done) => {
             if (env.CERTS_URL) {
                 const resp = await fetch(`http://${env.CERTS_URL}/provision`, {
                     method: "POST",
-                    body: {
+                    body: JSON.stringify({
                         domain: req.body.domain
-                    }
+                    })
                 });
 
                 console.log(await resp.text());