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Invalid authentication credentials using Live API Keys

Hi, why does when we are using Live API Keys we are having "Error processing checkout. Please try again." error? If I check the logs it says:

2022-06-22T03:38:00+00:00 ERROR [Process Payment][createCheckout] {"error":"Invalid authentication credentials. Kindly verify if the key you are using is correct.","code":"K003","reference":"d6d25e30-4708-45a1-8f81-2aeb4a6a592d"}

But when we are using sand box mode we don't have any errors. We already check multiple times our PK and SK are correct. Please help us on this.