"Invalid State" error when i try to format a new 64GB Card

Hi, bought a used MKII, now this is the first thing i wanted to do, format a new card, i recieve an invalid state" error.
The CF card seems ok on my computer.
any suggestions?
cheers
chris

perhaps it’s not compatible with the OT - look here for anyone using the same card

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I’ve had thumb drives that were permanently read-only on some computers but not others, right out of the packaging (it was a known defect with certain Sandisk thumbdrives a few years ago), and once or twice I’ve had SD cards get stuck as read-only until I formatted them with the official SD Association formatting application (the OS couldn’t format them). I don’t know if that’s something that also happens with CF cards but it’s another possibility.