I'm having this exact same issue, using the genuine screen replacement from ifixit. I doubt both of us made the exact same mistake, so I think this indicates a problem that Google and ifixit should be investigating more deeply.
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=== Update (09/06/2022) ===
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I've solved this for my Pixel 6 Pro, so here's a quick guide... or links to other people's solutions, really.
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First, you need to go here, and download the Google USB driver: [link|https://developer.android.com|https://developer.android.com] /studio /run /win-usb (remove spaces, they truncated the URL if I post it normally); just get the Zip file and extract it. The Google USB Driver is located in \usb_driver\, I found the file named android_winusb.inf.
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CRITICAL: do not use Device Manager to install the file. Locate the .inf file within the extracted folder (mine was titled android_winusb.inf), then right click and select Install. If the Install option is not listed (Win11 doesn't show it at first), click More Options at the bottom of the menu.
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Then, go here (MUST use Chrome browser) and follow instructions: [link|https://pixelrepair.withgoogle.com/udfps|https://pixelrepair.withgoogle.com/udfps]
I'm having this exact same issue, using the genuine screen replacement from ifixit. I doubt both of us made the exact same mistake, so I think this indicates a problem that Google and ifixit should be investigating more deeply.