4 machines rejected the coin, that clearly suggests the coin was not within the tolerances expected. Dubliners will be well familiar with the classic 1999 pound coin and parking meter issue, the machines were right, it turned out there was a small change to the weight of the coin itself in that years issue due to a different alloy
Any machine which cannot give change will indicate that restriction before you begin the transaction. By design if you cancel you will be returned the exact coins as you inserted
All transactions can be paid for by credit or debit cards, no minimum amount restriction is applied
The clerk and the ticket barrier will issue a manual ticket in these circumstances
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