Xerox and FujiXerox are different companies, so we have no access to the device you are referring to, but as a whole, Bypass trays typically cannot be used in Autoselect, so there is no point of setting a priority, so it simply does not allow it to be done. But if it can be made selectable in Autoselect (Consult the user guide) it would then allow a priority to be set afterwards.
No idea what "Check Bypass" could mean, with Xerox it typically tells what to check it for, I guess they don't.
This printer comes up with Check Bypass when trying to print. Other trays work okay. Printing out Job History and Settings is the same, so is not driver.
The only clue is that on the CenterWare Web interface, cannot set a Tray Priority for the Bypass Tray.
Could the firmware / software be corrupt?
Thanking you in advance for your experience !
Flagstaff