Hi there.
There are two reasons why the amount showing for your B.C. Sales Tax credit is "$0.00". First, you may not meet the eligibility requirements for the credit. Secondly, it could be reduced to zero by your net income - the credit amount is reduced by 2% of your net income greater than $15,000. This means that, while you may qualify for the credit, your income is higher than the threshold to receive an amount for the credit.
For more information, here is the B.C. government webpage regarding this credit: https://www2.gov.bc.ca/gov/content/taxes/income-taxes/personal/credits/sales-tax
I hope this helps.
Fraser