You need a minimum amount of employment income to be eligible for the Canada Workers Benefit (CWB). The minimum is different between provinces & territories, but in most cases, it’s $3000.
You may want to choose to include tax-exempt income in the CWB calculations if your taxable employment income is not enough to get you the credit. The tax-exempt income that can be used in CWB calculations is the tax-exempt part of working income earned on a reserve and/or an allowance received as an emergency volunteer.
For more information on the Canada Workers Benefit (CWB), please see this Canada Revenue Agency (CRA) webpage: Canada Workers Benefit (Working Income Tax Benefit before 2019)
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