Adding troubleshooting notes

Author: whhender

articles/purview/troubleshoot-connections.md

@@ -81,6 +81,13 @@ To verify this, do the following steps:
 
 If you don't see your Microsoft Purview managed identity listed, then follow the steps in [Create and manage credentials for scans](manage-credentials.md) to add it.
 
+## Scans no longer run
+
+If your Microsoft Purview scan used to successfuly run, but are now failing, check these things:
+1. Have credentials to your resource changed or been rotated? If so, you'll need to update your scan to have the correct credentials.
+1. Is an [Azure Policy](../governance/policy/overview.md) preventing **updates to Storage accounts**? If so follow the [Microsoft Purview exception tag guide](create-azure-purview-portal-faq.md) to create an exception for Microsoft Purview accounts.
+1. Are you using a self-hosted integration runtime? Check that it's up to date with the latest software and that it's connected to your network.
+
 ## Next steps
 
 - [Browse the Microsoft Purview Data catalog](how-to-browse-catalog.md)