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Yes, the facts you presented indicate that employee's withholding was correct at "$0". 

Since you are using an automated payroll system (QuickBooks Payroll), the amount withheld is calculated using a percentage method, rather than tables. The calculation will depend on what type of Form W-4 was used to enter withholding allowances.  The amount of tax withheld will be different depending on the selection made on Form W-4 for 2020, oe if using  a Form W-4 from 2019 or earlier.

We cannot show the actual calculation without having the source documents, but you can see how it is determined at Worksheet 1. Employer’s Withholding Worksheet for Percentage Method Tables for Automated Payroll Sys....

The attached table also shows your employee's withholding as "$0" using the Wage Bracket Method for a manual payroll.