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I am also having the same issue. I bought two devices from Best Buy, both "unlocked Google Pixel 8", and OEM Unlocking has been greyed out for the past 2 days. I am connected to WiFi, have setup the devices, and everything I can think of. I opened a support ticket to Google and the representative confirmed my devices were unlocked on their end. The rep had no idea what the issue could be. I already brought one device back and managed to avoid the restocking fee by claiming it was defective, but I'm starting to think this is a bigger issue than a few devices... I have bought many unlocked devices from Best Buy in the past and never had an issue unlocking the bootloader.
I also checked on "store.google.com/repair" with my IMEI numbers and both devices were shown as "Google Pixel 8 (Unlocked)". Very strange.