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35131: Invalid 'SendAt' value

ERROR: 35131

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PROGRAMMABLE SMS
ERROR

Description

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You specified an invalid value for 'SendAt'. It should be valid timestamp in ISO 8601 format

Possible Causes

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You specified a 'SendAt' value which is not in ISO 8601 format

Possible Solutions

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Specify a value for 'SendAt' in ISO 8601 format