The option to enable IPP Printers is unavailable - c07722236
If when loading the Workflows - IPP and Native iOS Printing tab, the option to enable printers is unavailable, this indicates a conflicting workflow is already enabled. The most common scenario is that Discovery has been enabled on that print queue. Discovery enables IPP and printer discovery using mDNS and therefore IPP does not also need to be enabled.
If the service requires IPP and Discovery (native iOS/AirPrint submission) on the same device, a duplicate PrinterOn printer will be required which can have all the same configuration outside of the Discovery or IPP setting.