Bitlocker doesnt auto-unlock ext drive

[Waldorf]

Thought it was caused by drive being disconnected (ext backup), but even if i connect, unlock the drive, its locked again after reboot.
win/bitlocker setting all show auto-unlock enabled, confirmed with cmd, not using mb tpm module, thanks to the MS win 11 crap.

just did the also recommended de- and re-encryption of the drive, no change, drive is always locked when im back in win.

 

[Solaris17]

not using mb tpm module

This is the problem.

If you are not using the Key on the built in TPM or using a thumb drive with the key on it, it is not going to unlock automatically. There may be a sub GPO that can help with this but I havent looked at it in a long time.

 

[Waldorf]

i do have a usb stick (constantly connected) with the keys, and it does unlock all other drives on boot, just not the one connected of usb-c.

 

[SPDIF]

I had the same problem with some PC here.

I think Auto-Unlock is not supported on removable media encrypted with BitLocker To Go. Because the drive is flagged as “removable,” Windows forces a manual unlock each time you plug it in, even if you’ve saved the recovery key on a USB stick.

I could fix it by marking it as fixed, my usb adapter allowed this and i could turn on auto unlock in Bitlocker.

I know you also could use some script to auto unlock a drive like this without TPM, i have to look up that.