In all likelihood you did not have a 2021 carryback adjustment. The best thing to do here is just answer no and continue on. I am including a link below from someone else who posed the same question. Be advised that one of the respondents was a bit terse but that does not take away from the fact that you should just answer no.
The adjustment generally pertains to foreign tax credits from prior years.
What is a carryback adjustment?
@hellotax1111
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