A lot of things

app/Support/XenForoCauserResolver.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Support;
+
+use App\Auth\XenForoUser;
+use App\Models\LogXfUser;
+use Illuminate\Database\Eloquent\Model;
+use Spatie\Activitylog\Support\CauserResolver;
+
+class XenForoCauserResolver extends CauserResolver
+{
+    public function getDefaultCauser(): ?Model
+    {
+        $user = \Auth::user();
+
+        if( $user instanceof XenForoUser && $user->getAuthIdentifier() ){
+            return LogXfUser::find($user->getAuthIdentifier());
+        }
+
+        return null;
+    }
+}