Docs:

-Force
Overrides the read-only attribute, allowing you to add content to a read-only file. For example, Force will override the read-only attribute or create directories to complete a file path, but it will not attempt to change file permissions.

See the stack overflow post for a repro:

https://stackoverflow.com/questions/48425562/powershell-add-content-should-create-path-but-throws-exception-could-not-find-a

Document Details

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• ID: a897598d-a60b-a452-592f-3b166fc5b4ed
• Version Independent ID: 0832dec4-5caa-3871-459d-0e8a3543cd07
• Content: Add-Content (Microsoft.PowerShell.Management) - PowerShell
• Content Source: reference/7.1/Microsoft.PowerShell.Management/Add-Content.md
• Product: powershell
• Technology: powershell-cmdlets
• GitHub Login: @sdwheeler
• Microsoft Alias: sewhee