Hello Θεοδωρος νουβακης,
thank you for posting on the Microsoft Community Forums.
When Windows asks for a BitLocker recovery key, it means that BitLocker cannot automatically unlock the drive. This can happen due to hardware changes, firmware updates, or other security concerns. If you lost your recovery key, please follow the steps in Find your BitLocker recovery key - Microsoft Support to recover it.
**Important:**Microsoft Support is unable to provide, or recreate, a lost BitLocker recovery key.
Regarding pin issue, which is out of my scope, it is recommended post it under this pod:
Best regards,
Lei