@Dohn344164721n7v Thank you for sharing the details.
This behavior is not specific to Edge, it's the way "Microsoft Print to PDF" creates PDF files. When you use the Print dialog to generate a PDF (via Microsoft Print to PDF), the output is rendered as a flattened image of the page.
The Highlight Text tool can only highlight "real" text. If a document is scanned or text was converted to outlines/images, you cannot use the highlight tool.
In contrast, when you use Save / Save As > PDF (or Edge's native "Save as PDF" option), the file retains its underlying text structure, which is why highlighting works normally in that case.
When printing from Edge, look in the printer list for "Save to PDF", using this instead of "Microsoft Print to PDF" will allow you to select and highlight text when viewing the PDF.
Please note that this is a limitation of Microsoft Print to PDF; it renders pages as images, stripping out real text. Using Save as PDF is the correct workaround.
I hope this helps.
Thanks,
Anand Sri.