Update FederationController

app/Http/Controllers/FederationController.php

@@ -195,7 +195,7 @@ XML;
             && is_array($bodyDecoded['object'])
             && isset($bodyDecoded['object']['attributedTo'])
         ) {
-            if(parse_url($bodyDecoded['object']['attributedTo'], PHP_URL_HOST) !== $idDomain) {
+            if(parse_url($bodyDecoded['object']['attributedTo'], PHP_URL_HOST) !== $keyDomain) {
                 abort(400, 'Invalid request');
             }
         }