Is the with all the USB sticks? or the one you used when "with Offsite access" is the enabled?
if only specific usb, check for .cekey file in the USB and clear it. .cekey file will be visible only when you set to "show hidden files and folders" and uncheck "hide extensions for unknown file type". this .cekey will be recreated on next policy enforcement.
Thank you so much jags i was sort out exactly the same solution you mentioned. Thanks again