Income tax notice but unable to file updated return

I have received a Intimation u/s 143(1) notice on Jan 17th 2025 with notice of demand u/s 156 of the Income Tax Act, 1961. When checked my ITR somehow my HRA exemption is missing in my return filing.
When I file rectification its not allowing saying gross amount is changed. I am unable to file revised or updated return as I see only 139(8A) option when filing again. What should I do in this case, please suggest.