Stock losses due to company went into bankruptcy a year ago, can i still deduct that loss from my taxable income

I lost money I invested in stock as the company in which I invested went into Bankruptcy in 2019. My question is :
(a) can I declare the loss in my tax return for 2020 as I did not declare that loss in my tax return filing for year 2019 ? 

As fidelity tax form 1099 apparently does not show that loss on my tax forms neither for 2019, nor for 2020 , but it shows that loss in fidelity year end statement of 2019.

 

I did not declare this loss in 2019 filing as i thought i will show up in 2020 but it again did not show up in 2020 1099 form.
Please help with the answer. Thank you

 

 

 

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