What does Txn not permitted on card mean?

Could you please clarify what "Txn not permitted on card" means? Is it an error message that appears when attempting to make a transaction with a credit or debit card? If so, what could be the possible reasons for this message to appear? Is it related to the card's limits, security measures, or something else entirely? It would be helpful to understand the context in which this message appears to provide a more accurate explanation.