Thanks for writing about issue that you are facing.
Can you please help me with more details so that I can investigate it further.
In details please share:
1. Can you send me the steps to reproduce the issue
2. Some sample file with which you are facing the issue
3. A screen recording showing the problems you are facing.
Thanks in Advance. Any help is really appreciated.
I have followed all the steps in the indesignsecrets link and it has fixed the problem with the transparency but created other issues with the quality of the printout.
How do I send you a file?
If you place an image with a transparent background on a coloured box (all cmyk) in InDesign and print it, does it work for you?