Intimation u/s 143(1) - Missed specifying the HRA

I’ve received an intimation u/s 143(1) for assessment year 2020-21 demanding an amount of money.
For that period I had filed ITR-2 but did not specify the HRA component provided by the employer. I missed that.
I have the form 16 from the employer which specifies the HRA component. Since the time to revise the ITR is already gone, is there any way to correct it now? Or I’ll have to pay the amount of money.

Please note that the assessment year is 2020-21.