A success message on the listing site confirms its own action. Look for a vote event with the same timestamp and player name in your server console.
Compare a simulated vote with a real one
With a test player online, replace the placeholders and run the admin test vote. If it awards correctly, make a real vote and compare the received event and ServiceSite.
/av vote TestOyuncu SITE_KIMLIGI
If no real event arrives, check the listing site’s NuVotifier host, port and authentication settings. If an event arrives but no configured site matches, compare ServiceSite in VoteSites.yml with the value the server received.
If the site matches, run the reward command against the test player on the backend that handles rewards. On proxy networks, the receiving server and the server with crates or economy may be different. Test offline delivery separately.