After messing with this same issue for a few hours, I narrowed it down. While it worked in admin and not a user there must be some difference. I opened a notepad as admin and one notepad as the user. When I went to print the OLD print style was there. AND the fax shows up. The user notepad showed the new print dialog. No fax.
Ran this to disable the new dialog
reg add "HKCU\Software\Microsoft\Print\UnifiedPrintDialog" /v "PreferLegacyPrintDialog" /d 1 /t REG_DWORD /f
And my user is able to fax. Hope this helps! Spent hours going through event logs, fax logs, process explorer output for the issue and nothing I tried or looked into had any success.
I hope this helps others! If it does, please reply!