I exercised my ISOs and filed form 3921 in 2023, my shares worth zero when company was acquired in 2024. How to claim my loss?

In 2023, I exercised my ISOs and filed form 3921

In 2024, the company was acquired for a low price and my shares worth zero. They used SRS Acquiom to close the deal. When I contacted  SRS Acquiom, they said since they didnot send out a payment to me, so they won't provide a tax form for me to use.

I was wondering what form I need to fill to claim my loss. The time frame between I exercised my ISOs and they were sold as zero is less than one year, if that matters.