Digital BW, The Print

Hello,

I wonder if someone here might have stumbled upon a situation I am
faced with and found a solution.

In order to mimick a selenium toned image I converted a 16 bit color
image into greyscale then down to 8 bit and finally into a duotone.

I tried to import this image in Lightroon but it doesn't want to
cooperate.

I had similar issues on some images where I hadn't enabled
compatibility mode but in this case I even saved it as a copy with
compatibility mode enabled but still no joy.

Any suggestions?

Thanks,
Pierre