I have this issues as well, i got a response from PSO2 support today:
**The PSO2 Team (PSO2)
Jun 14, 2021, 13:10 PDT
Hello ARKS operative,
I am sorry to hear that you are still experiencing an issue with your missing purchase. We would now like to clarify how you would like to proceed with your issue.
If you would like the transaction refunded and the amount that was charged returned back to you, we regret to inform you that we will not be able to perform this action through this channel. We request that you contact Steam support (https://help.steampowered.com/) for further assistance.
First, we would like to verify that you are redeeming the purchase on the same platform that you purchased the item. Keep in mind that purchased items and premium currency must be claimed on the same platform that they were purchased on: Xbox One or Windows 10 for purchases from the Microsoft Store, Steam for purchases from the Steam Store, or Epic Games for purchases from the Epic Games Store. Please log into the game lobby of the correct platform and check if you received your purchase.
Next, If you have successfully refunded a similar transaction in PSO2 prior to your missing purchase, this may have had an effect on your missing purchase.
If you would like us to instead investigate the missing transaction further, please provide your entire transaction history for only PSO2. These transactions include both completed purchases and refunds that were made on your account.
You can do this by logging in to your Steam account at https://store.steampowered.com/account/history. This link will take you directly to your purchase history page. Once you have logged in you will be able to verify each transaction that was made, when the transaction was made, the order number and amount for the transaction. Check each order detail for all the PSO2 transactions you are reporting by clicking on the transaction, then save each transaction as a separate PDF file. You can attach your entire transaction history to this ticket.
Once we have received your transaction history, we can then begin our investigation. We apologize for any inconvenience this has caused you so far and patiently await your response.
ive sent them the receipts from steam, hopefully they can fix it