If the official token server is down or you cannot wait 7 days, some independent developers offer "token bypass" tools. These work on OnePlus 8/9 series (not 10/11 yet). Services like or Hydra Tool (paid) can simulate the unlock token.
To resolve this and successfully unlock your bootloader, follow these essential steps:
# Patience. Then perseverance. fastboot flash unlock_token your_token.bin && fastboot flashing unlock