A lot of people are using it successfully. I’m looking closer at the payment you mentioned and PayPal is reporting it as “PENDING_REVIEW”.
I don’t know if this a review period that PayPal has to do, or you have to do. Maybe you can check the transaction page for that payment on your account.
Once the payment leaves pending review state then then buyer will be able to access the files.
PayPal may be putting a hold on your buyer account because you just created it, and it maybe was flagged.
Thanks