Welcome to the Forum, @cbdave! 
How did you do that? Is it possible you submitted a log and didn’t create a ticket? People often get confused by the difference. See also Friendly Reminder About Logs.
If you’re sure that the cards are good and working in other devices, then I imagine the issue is probably with the new Cam v4, so Support definitely needs to know about that. One other thing you could try is an “Overwrite” format on one of the cards using the SD Memory Card Formatter, because that can sometimes “revive” problematic cards, but I’m not sure how much that would yield for you if the cards are already working in other devices. 
I think the primary solution here will probably involve following up with Support and possibly getting a replacement.