title: Notification error: APN invalid token
body: <p>I stopped receiving the push notifications after the certificate got expired and new certificate has been created. I've updated the p12 certificate on the server.</p>
  
  <p>I'm using Pusher application to debug the issue further and I tried importing the p12 certificate with the device token. It says "APN invalid token".</p>
  
  <p>Same method works for my other application.</p>
  
  <p><a href="https://i.stack.imgur.com/qJHlc.png" rel="noreferrer"><img src="https://i.stack.imgur.com/qJHlc.png" alt="Notification Error: APN invalid token"></a>
  Please help me with this I'm not an expert, I tried searching the solution in SO but couldn't find the exact problem.</p>
  
  <p>Any tips will also be appreciated. Thanks in advance!</p>