@j g - the wash sale rules pertain the to 61 days surrounding the time you sell a security at a loss - that period is 30 days before and 30 days after the sale occurs. You can not purchase the substaintally same sucurity during these 61 days and take the loss on your tax return.
You state you purchased LW on May 1 and May 15. The fact that the purchases occured in two different accounts is immaterial. You then state you sold some of the LW shortly after May 15 (but presumably prior to May 31)
The wash sale rules are in effect because that sale at a loss occured within 30 days of the purchase of the same security that occured on May 1.
The loss is not deducible until shares originally purchased on May 1 are sold - even if that is years into the future. The loss that occured shortly after May 15 is simply added to your cost basis on the May 1 lot of securities purchases.
here is a good aricle on the subject:
https://www.fidelity.com/learning-center/personal-finance/wash-sales-rules-tax#:~:text=The%20wash%2D....
