This is literally documented[0] and reported to you when setting up bitlocker[1]/creating a user account[2].

[0]: https://support.microsoft.com/en-us/windows/finding-your-bit... [1]: https://www.windowspro.de/sites/windowspro.de/files/imagepic... [2]: https://www.anoopcnair.com/wp-content/uploads/2019/11/switch...