Hi, Yes, this is a known issue with the QuickBooks connector in Airbyte. The refresh token expires after each use with the QuickBooks API, but the connector does not handle the renewed refresh token that is returned from the API. This issue was discussed in [this forum post](
https://discuss.airbyte.io/t/1733) and [this GitHub issue](
https://github.com/airbytehq/airbyte/issues/3990). As of now, there is no permanent fix for this issue. However, the Airbyte team is working on upgrading the QuickBooks connector from alpha to beta, and this issue is expected to be fixed in the upgrade. You can keep an eye on the [GitHub issue](
https://github.com/airbytehq/airbyte/issues/3990) for updates. In the meantime, you'll need to manually update the refresh token in the source settings each time you want to sync. I hope this helps!