Yes, you can claim it on your 2020 tax return if you have not received it by the time you file. There are many people that have not received their refunds from the 2019 return, mostly people that filed by mail and did not use e-filing. But if your 2019 tax return has not been processed, that would explain why you did not get the 2nd stimulus. @nekoll1986
To check on the status of your 2019 tax return, you can use the Where's My Refund page at the IRS.
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