An Agent's user email address does not match between your CRM/TMS and Sisu (review steps on how to update your Agents List below).
An email address is missing for a Lead in your CRM/TMS. This is required even if you have to use a fake one.
The Deal, if you are a Follow Up Boss User, is in a Deal Pipeline or Deal Stage that is not supported by the Realsynch integration. Please review the articles in our Follow Up Boss to Sisu Knowledge-Base for more insight.
The Deal or Transaction in your CRM/TMS must be associated with a Contact.
The Deal or Transaction in your CRM/TMS must be associated with a User.
A Deal or Transaction must have originated in your CRM/TMS and integrated into Sisu to create a Transaction in order to update the Sisu Transaction.
Integrations will never update Closed, Lost, or Archived Transactions in Sisu.
Ensure the scope and date range you have set in Sisu is not filtering out your results unintentionally.