It looks like you added the OneSignal code to your site but you are using our WordPress Plugin which adds this code for you.
Adding the OneSignal init call multiple times to your site will cause issues.
If you plan to use our plugin, please remove this code and our service workers from the root directory if you added them:
<script src="https://cdn.onesignal.com/sdks/OneSignalSDK.js" async=""></script><script> var OneSignal = window.OneSignal || []; OneSignal.push(function() { OneSignal.init({ appId: "15908692-ac8c-43cc-a232-3422a11bfe5f", }); });</script>
Please only follow the WordPress setup docs here: https://documentation.onesignal.com/docs/wordpress
For troubleshooting, please review some tips on our WordPress Troubleshooting guide.
After removing the code you added, then if you are still having issues please contact [email protected] and our team will be happy to assist in more depth.
Thank you!