"there is no data to show" retrieving data from CRM based on zcrm_account_id retrieved form books

"there is no data to show" retrieving data from CRM based on zcrm_account_id retrieved form books

I have some code (dot net) in which I retrieve invoices from Books.  I retrieve the vale zcrm_account_id.

I then do a call like this:

https://crm.zoho.com/crm/private/xml/Accounts/getRecordById?authtoken=SomeValue&scope=crmapi&id=RetreivedValueOfzcrm_account_id

but get "there is no data to show" returned.  

ANy suggestions for what I am doing wrong?