Either you set the print policy to BW CWIS > Properties > Services > Printing > General
Or you have an accounting system for color print (Apple doesn't support this) so it prints BW instead of failing the job, those 2 options are here.
CWIS > Properties > Login/Permisions/Accounting . User Permissions > User Permissions Roles > Edit
If option 2 is the issue, you may be able to set the iPhones/iPads as IPP exceptions and cludge it into working, but you definitely won't be able to track the user.
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for posts that resolve your issues. Your feedback counts!Joe Arseneau