Unable to bypass factory reset protection even with the original Google account

Unable to bypass factory reset protection even with the original Google account

Hi, I bought a Nexus 5X for a friend a few weeks ago and got it updated to Nougat. I used my own Google account to setup the phone and install some apps. Then, I removed the device from my Google account, factory reset it, and gave it to friend. When he switched it on, it asked to enter the original owner’s Google username and password, so I gave mine. But after logging in without any error message, the phone displays the same screen over and over. Asking to enter the original owner’s Google username and password. We tried to wipe user data in recovery mode also. But the same issue occurs. Anyone knows how to fix this? Please help.