IMX7 D i2c3 setup

Having issues getting I2C3 working correctly
HKLM/Drivers/Builtin/I2C3
SclAF =0 (DWORD)
SclPin=81 (DWORD)
SdaAF=0 (DWORD)
SdaPin=94
Dll= i2c_imx7.dll (STRING)

when i use the i2c tool i can see devices on i2c1 & i2c9 but nothing on i2c3
i can see its loaded on the dbg/ com output upon boot