Online Failure Notification: IATS REJECT: IO ERR - Unknown Error

Some users report that online donations are failing with the following message in the organization's Online Failure Notification email when using IATS to process transactions:

eTapestry Message: 26 - The credit/debit card information supplied was invalid.
Processor Message: REJECT: IO ERR - Unknown Error

Article Number: 113825

Products:

Blackbaud_eTapestry

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