AEA when disposing of a deceased's property over a 3 year administration period

I have recently sold my late father's property. He died 25/12/22 and the property sold 22/11/24. There was a gain on the value of the property from the original probate value to the eventual sale price. When completing the CGT declaration on Gov.uk it suggests we may be entitled to use the AEA from the year of death (2022 £12,300) and then up to two subsequent years (2023 £6,000 & 2024 £3,000) . When completing the online form it only allows me to enter the 2024 allowance of £3,000. How do I enter the two other periods that are within the administration period?

Hi
You are only due the annual exempt amount in the year of disposal. The guidance states that the allowance may be available in the year of death and following 2 years, not all 3 years allowable in the 1 year.  The unused allowance cannot be carried forward. This applies to everyone.