Thanks for reaching out.
How exactly do you save or export an MS document to PDF? Do you convert the file using Adobe Acrobat or Save it as a PDF using a Microsoft printer?
If I save/export/print to pdf by setting options tp PDF/A it retains the colors but will revert if I edit the pdf. "This file claims compliance with the PDF/A standand and has been opened as read-only..." once I enable edititing it changes all the colors. to black again.
If setting the option to PDF/A retains the colors, but gives the following error, then try changing the following preferences setting in Acrobat:
Open Acrobat>Edit>Preferences>Documents> View documents in PDF/A mode: Never >OK