Can't unlock bootloader to try FP5 test session

Hi. I’m trying to install Murena according to this community test session and can’t seem to unlock the bootloader. After adb reboot bootloader, fastboot flashing unlock just hangs on < waiting for any device >. Any tips would be appreciated. Thanks.

Regain your privacy! Adopt /e/ the unGoogled mobile OS and online servicesphone

For test builds and comments on support pl use the test channel.