I have users (less than 1%) that are experiencing this as well on production. I realize the OP specified the sandbox environment but I thought I'd try adding to this post since the issues seem similar and error in the response is the same. Unfortunately I have no additional details I can add to help figure out what's going on here. A similar post (https://www.paypal-community.com/t5/SDKs/Sandbox-Account-Error-Order-could-not-be-captured/td-p/1761588) I found suggested that users may need to log out and then log back into paypal. I'll report back here if that fixes the issue. It would be nice if a paypal engineer commented on the status of this issue -- waiting for more info, looking into the logs and trying to reproduce, etc. Merch ID: V5UX5DWTG5PCC
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