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Check Userpool whether it has pre-sign-up lambda enabled. If so, the check the lambda return value. https://docs.aws.amazon.com/cognito/latest/developerguide/user-pool-lambda-pre-sign-up.html
This is the best guess based on the symptoms described.
Providing more details around the errored API and its console log might be helpful.
已回答 3 个月前
