We read in the datasheet that "The SPI master interface has been tested with EEPROM, flash and serial RAM devices and has been confirmed to function properly in all cases".
Since the ADAU1467 EVK only uses EEPROM and SigmaStudio does not support Flash programming, it can not be pre-tested by EVB and SigmaStudio.
Please list the part number of the flash memory you are testing.
Is there any flash programming sample code using ADAU1467 that can be downloaded for reference?