Ensure req.hostname is shared as the preferredUsername

routes/actor.js

@@ -32,7 +32,7 @@ module.exports = {
                 },
                 'as:manuallyApprovesFollowers': true,
                 'outbox': `https://${req.hostname}/actor/outbox`,
-                'preferredUsername': '${req.hostname}',
+                'preferredUsername': `${req.hostname}`,
                 'url': `https://${req.hostname}/about/more?instance_actor=true`
             });
             return res.end();