Reverse split stock - exchange & cash in lieu transactions

Hi,

 

I purchased 60 for $16/share and 50 shares for $8/share on two different dates 02/21 and 03/21 respectively, So total cost basis is $1410 then fast forward to 08/01/23 the reverse stock split happened and see two transactions.

 

exchange -50 amount 0

cash in lieu $12.40

 

When I received the form 1099-B it was reported cash in lieu only with no loss but I actual have a loss.

 

Cash/Lieu 08/01/23  12.40 N/A

 

How would I report it as a loss?