Hi Amanda#01,
Thank you for reaching Microsoft Community. I'm sorry to hear about the issue you are having with the Windows Hello camera on your new Surface Pro 8.
Does the issue only occurs on on the Windows Hello camera? How about when opening the Camera app of the device then using the front and rear camera, are they working fine?
Please try first to boot the device to its UEFI screen. See this page: How to use Surface UEFI (microsoft.com) for the steps on how to get to the UEFI screen. Once you are on the UEFI screen, go to Devices. Check if the IR camera option is enabled. Enable if not but if it is already enabled, please disable the option first then select Exit > Restart now. After the restart, boot back to the UEFI screen and enable the IR camera back.
If still the issue persist, please run these steps below:
1: Run Surface Diagnostic Toolkit
See: Fix common Surface problems using the Surface Diagnostic Toolkit (microsoft.com)
2: Check for Windows Update
Go to Windows Settings > Update & Security and select Check for updates
Make sure all updates need are installed including Optional updates
3: Update drivers and firmware
Check what is the current OS Build of your Windows version by going to Settings > System > About.
Go to Download driver and firmware for Surface, choose Surface Pro
Then click the link next to Surface Pro 8 then click Download on the next page.
Choose the .msi file that matches your current OS Build and click Next.
After downloading, run and install the .msi then Restart.
4: Run System File Checker Tool
See: Using System File Checker in Windows (microsoft.com)
Hope this helps.