I am encountering an error where, on some devices, the purchase process works fine, but on others, I receive the error: "Unable to complete request," with no additional information. The products are loading correctly, but the error occurs when I attempt to make a purchase. What could be the possible causes for this error, and under what conditions might it occur?
Rajatalha
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I think it's a bug from Apple. In my case, I deleted the application, restarted my iPhone, and then reinstalled the app from TestFlight. It started working again.
I have answered to this question. Kindly follow this link it might help you
https://stackoverflow.com/questions/76849106/an-error-has-occurred-try-again-later-in-app-store-connect