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I got my phone through my carrier. Unbeknownst to me at the time, carrier provided phones have locked bootloaders so you can’t install grapheneOS on them, or if you can, I haven’t found a guide to reliably do so. The phone was $800 off through the carrier so I can’t complain too much, but I would have got it straight from Google if I had known prior to buying that you can’t install grapheneOS on it.
All modern phones come with a locked bootloader. This is to protect the OS and the User data, preventing anyone with physical access to the devixe from reseting the device and installing their own software without permissikn. I had to unlock mine on my 1+ 7P before installing /e/OS. It might just be that carrier locked phones might need something extra to unlock them not sure.