Client clicks on CTRL+P or Right click + print and both does not work
Try printing directly (without fireglass) with the same environment (Edge web browser & windows10). If it doesn't work directly then it means it's not related to FG.
If edge doesn't use any internal viewer nor acrobat plugin, escalate to R&D, this probably means that there is an issue with the printing mechanism (similar to the known limitation that exists in firefox).
Following step 3, if edge browser works with a PDF viewer and didn't succeed to print, look at the fireglass.log on the TIE to verify printing action was indeed executed: