I am uploading a product from Printful but I receive the message as Esty Client Exeption!
I have tried multiple times and the same thing!
I don't know the reason I have no account issue!
Best
At some point recently printful and Etsy integration broke and we had to resync the connection, have you had printful for a while and have you done this? In your store on printful look for any warning or notification on the page, your store may not be synced.