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Likely cause: The API token or OAuth refresh token for the destination has expired or been revoked. This commonly happens when someone changes the password on the connected ad account, or when Meta/TikTok rotates tokens after a security event. Fix:
  1. Go to Destinations → click the affected destination.
  2. Click Reconnect or Re-authorize to initiate a fresh OAuth flow.
  3. Sign into the destination platform and grant permissions again.
  4. After reconnecting, check the destination’s Event Log in Upstack. You should see new events being delivered within a few minutes.
  5. For Meta specifically: if you manage multiple Business Managers, verify you’re authorizing with the account that owns the target Pixel — using a different account will cause a permissions error.
For the full reconnect walkthrough with screenshots, see How to reconnect a disconnected integration.
Still stuck? Contact support@upstackdata.com with your Pixel ID and a description of the issue. We typically respond within a few hours.