I have migrated from a physical Presto Card to a digital one and I am finding that the digital card only scans successfully on the first attempt about half the time. The other times, it will tell me to try another card or that the card was already scanned (even though the gates didn't open). I find myself then scanning my credit card (and hoping I don't get double charged) or going through the cash fare gate and having to explain it to the fare collector.