Connect your subaccount

Create a Private Integration inside your subaccount (Settings > Private Integrations), grant it the scopes below, then paste the token here. The private integration token needs at least: contacts.readonly, opportunities.readonly, users.readonly, locations.readonly, locations/customFields.readonly, locations/customFields.write, conversations.readonly (optional, for activity staleness).

Connected. Custom fields verified/created, first data pull started.

Your dashboard URL:

To embed it in the subaccount, add an agency Custom Menu Link pointing to: