I had the same error "transaction cannot be completed at this time" tonight when trying to transfer money from a visa debit card I'd used before to Paypal. I couldn't get an answer from Paypal or my bank either, and finally tried turning off my VPN (remembering that another bank won't let me use online banking when I'm on VPN). Sometimes VPN looks like too many people are using the same IP address, or the transaction request is coming from another country, so some banks don't like it. You can try turning off your VPN while banking if you use one, and see if that works.
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