You can have one subscriber per account or other related entities.
When Fuse builds your campaign, it will add a subscriber to your sequence. By default, that subscriber is your Account.
However, in some cases, you will have the option to key unique subscribers per entity, such as Claims, Leads, and Policies.
Accounts
This is the default configuration for Fuse. For each account in your segment, you'll have one subscriber. Fuse also stores Primary Contact data at the Account level, so Account context can also be used to target specific Primary Contacts.
Secondary Contacts
For each Secondary Contact matching your segment, you'll have one subscriber. Only for systems that support secondary contacts.
Policies
For each policy matching your segment, you'll have one subscriber. This is supported with all integrations.
Claims
For each claim matching your segment, you'll have one subscriber.
Only available for systems that support Claims.
Leads
For each lead matching your segment, you'll have one subscriber.
Only available for systems that support Leads.