No one here knows. The IRS has identified some people who could have gotten the 3rd stimulus payment on their 2021 return. If someone else could claim you as a dependent for 2021 then you were not eligible then and are not eligible now. We do not know who they are. You can check your online account with the IRS to see if the IRS shows that you already got the $1400.
https://www.irs.gov/payments/your-online-account
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**