Nanosound DAC V1.0 no display output

Hello, I might be wrong here but You don’t ask You don’t get. If done a clean install of Volumio on Pi3b+ with a Nanosound DAC V1.0 everything seems to be work great with exception of the OLED Display on the Nanosound. I have as far as I know done everything by the book but not screen output.
Any ideas? Troubleshooting steps/pointers?

Thanks Thomas