When filing my taxes in 2021, I forgot to include a 1099-B that had Capital Losses. Is it possible to claim those Capital Losses in 2022?

[Bsch4477]

No. You have to amend your 2021 return. 

[DoninGA]

No.  You will have to amend the 2021 tax return to add the Form 1099-B to the 2021 return.

See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...