SanDisk Extreme Pro 64 GB issues with school video cameras

We purchased 100 of these cards for our high school TV program. When I try to use them in both of our Panasonic cameras (AG AC30 and AG-HMMC40P) we get a CHECK CARD error message. Other cards will read but not these. The cameras will not allow me to format them in the camera. Tried formatting them on Windows and Mac laptops with no luck. Any help would be greatly appreciated.