If you lost money on the sale of stock, you can receive a capital loss of up to $3,000 per year. Any additional loss will carry forward to the following years.
This is not a tax credit, it is a reduction in your taxable income.
Without access to your tax return, I cannot confirm if this was applied in your case.
To confirm:
Go to Tax Tools, see the bottom of the black column on the left
Tools
View Summary
Click 1040 Preview, again in the black column
Scroll to Schedule 1, line 13 to see your capital gains/losses