Hello Wendy Summers, welcome to Microsoft Q&A forum.
The sepia/brown tint is almost always a white balance issue. To fix this, you need to check if your camera has manufacturer software. Many webcams (Logitech, Microsoft, etc.) have their own software with white balance/color correction controls. Download from the manufacturer's website and look for the setting in that app. This is the same if it's a built-in laptop camera as well. Look in the OEM software (Dell SupportAssist, HP Support Assistant, Lenovo Vantage, etc.)
If you can't find camera software or the settings don't help, try adjusting your lighting—sepia tint often gets worse with warm/yellow lighting. Use natural daylight or cooler LED lighting instead, and avoid mixing light sources.
Also update your camera drivers: Device Manager > Cameras > right-click your camera > Update driver.
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