In the past I have been able to place a pdf with fonts that I may not have into Illustrator, flatten and then outline fonts to preserve the look of the original document. Now with latest version of Illustrator cc (26.3.1). it recognises fonts when placed, so I can't just flatten and outline as it replaces fonts, changing the look of the orignal file.
Unfortunately if you don't have the fonts you shouldn't really be able to use as you don't have the licence, so illustrator is acting as it should in my opinion..?
We are a print and signage company so we
have files supplied by clients, who have license to the fonts, we are just downloading the files for printing. We do ask them to supply files with fonts outlined, but occasionally they don't do this and rather than have to go back and forth with them, we have been able to just flatten the artwork pdf supplied and outline fonts.
It should still be working if you are placing the .pdf as a linked file.
Hi @laraw16041705 ,
if you have to import the PDF pages not as linked files do the outlines of fonts in Acrobat Pro.
There is a Single Fix Up for this at Print Production > Preflight:
( Adobe Community Professional )