Can't restore purchases on iOS sandbox environment

Hey everyone

I'm having trouble restoring purchases on iOS in a sandbox environment, whether it's through TestFlight or Xcode. I keep getting the error message 'restoreCompletedTransactionsFailedWithError - An unknown error occurred'

Has anyone else experienced this issue, and if so, how did you solve it? Or does anyone have any suggestions for what might be causing this problem?

Thanks in advance!

Can't restore purchases on iOS sandbox environment
 
 
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