Sage Intacct is a third party application and occasionally, when system updates occur, AssetAccountant™ can lose the integration connection.
In order to resolve this,
1. Go to Register Settings
2. Open the Integration Tab
3. Disconnect from Sage, and then reconnect
Related Articles: Sage Intacct - Integration https://asset-accountant.freshdesk.com/a/solutions/articles/60000690655