It looks like the issue is that the sms.code is being sent as a number and not as a string in the instances where you are receiving the errors. You should be able to fix this by ensuring that the sms.code value is always sent as a string. If this doesn't fix your issue or if you have any further issues with this, please contact the Sinch Support team (follow the guidelines in the Sinch Customer Support Process) and they can provide more detailed assistance. Thanks,
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