Short answer HubSpot's KB: tokens can use contact, company, deal, ticket or sender properties. With multiple associated records, a token may pull from an unexpected one. 1. In HubSpot The relevant screen in my demo portal. The snippet count and limit. 2. Worth knowing Preview with a real record before sending. 3. Related Token defaults. Sources HubSpot Community question: Custom Object Personalization Tokens in Sequence Templates HubSpot Knowledge Base: Add personalization tokens