Short answer
HubSpot's KB: the card shows on contact, company, deal and invoice records. It's added automatically unless you customized the right sidebar or installed after Oct. 7, 2025; then an admin adds it. Sync not found means the integration is active but that record isn't syncing.
1. In HubSpot
The relevant screen in my demo portal.

2. Worth knowing
Use the card first when a rep asks why a record isn't in NetSuite.
3. Related
NetSuite integration and record cards.