Hi Liz,
Please open Settings → System → Optional features. Click "View features". Type “fax”.
Select Windows Fax and Scan from the list and click Next and click Install.
If that doesn't help or the options are unavailable, here's an alternate method to install WFS.
Please open Command Prompt (admin) and run this command.
Dism /Online /Add-Capability /CapabilityName:Print.Fax.Scan~~~~0.0.1.0