Looking at the spec sheet, I'd say the I2C address for write commands to the AD5273 is 0b01011000 assuming no jumper is connected at position AD0.
That is 0x58 or decimal 88.
But, anyway its what the scanner sees thais important.
Incidentally, if you have another Arduino, you easily configure that as an I2C slave with a simple sketch to test the scanner etc.
