Data Migration Tool - format of Account ID when importing Potentials

Data Migration Tool - format of Account ID when importing Potentials

Hello,

Currently evaluating Zoho CRM and I'm testing out the Data Migration tool to import some historical Potentials. 

Unlike the import tool (which uses Account Name), the data migration tool maps to Potentials to Accounts using the Account ID. I've tried including the Account ID in my CSV file a few ways - "zcrm_185163200000XXXXXX" and "1851632000000XXXXX"... I've also tried using the Account Name.

No matter how I try, the tool skips the records as it is unable to map the account ID in the CSV file to a parent.... "Could not find a matching parent record for this look up field"

Has anyone run into this before? What format did you use for the account ID?