CRM Reference ID values missing from Zoho Books

CRM Reference ID values missing from Zoho Books

Perhaps I'm missing something but there are no values showing for the CRM Reference ID value for contacts from Zoho Books.  I verified the data source settings is retrieving this field from Books.

We have sync between Zoho Books and CRM in place and I confirmed that the contacts exist in both systems.  Also, when I retrieve the contact record via API call there is a crm contact id value.

See screenshot of simple contact report with missing IDs.

Shouldn't this field include the CRM contact ID value?

Thanks.