Hello, thank you for reaching out to Microsoft Q&A.
- Go to Start > Settings > System > Optional Features > View Features.
- Select "see available features".
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Find Windows Fax and Scan in the lists.
- Select the checkbox and click Add.
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Click Add.
Wait until the install completes.
Once completed, search for Windows Fax and Scan in the search bar on the taskbar and select the result to launch the app.
Let me know if you still need more help.