> ## Documentation Index
> Fetch the complete documentation index at: https://docs.inboxapp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Troubleshooting

> Fix sync issues, delivery icons, and common errors.

<CardGroup cols={2}>
  <Card title="Chrome extension troubleshooting" href="/help/troubleshooting/chrome-extension-troubleshooting">
    Fix a missing Inboxapp icon, linking failures, and common extension sync problems.
  </Card>

  <Card title="Messages not syncing" href="/help/troubleshooting/messages-not-syncing-try-these-fixes">
    Check the Chrome extension, XChat PIN, sync timing, and IndexedDB when DMs don’t appear in Inboxapp.
  </Card>

  <Card title="Undelivered icon" href="/help/troubleshooting/why-do-some-of-my-messages-show-an-undelivered-icon">
    What the red undelivered icon means on older encrypted messages, and why no action is usually required.
  </Card>

  <Card title="Failed to send icon" href="/help/troubleshooting/why-do-some-of-my-messages-show-a-failed-to-send-icon">
    What the red failed-to-send icon means on encrypted messages, and when to resend or delete.
  </Card>
</CardGroup>