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Make sure your Rescue Media has BitLocker support enabled by checking the Advanced options of Rescue Media Builder. At that point, you can always open Command Prompt in Rescue and use manage-bde to unlock that volume. That’s a Microsoft utility, so online documentation for usage is readily available.
Additionally, you can optionally have Rescue Media Builder store auto-unlock keys for BitLocker volumes within the Rescue Media itself if you’re comfortable with that. To do that, make sure the volumes you want to auto-ublock in Rescue are connected and unlocked when you do a full WIM rebuild of your Rescue Media. If your Windows partition itself has BitLocker enabled, then Rescue Media Builder will cache auto-unlock keys for volumes on the Windows partition so that future builds will have those keys even if the volumes you want to auto-unlock aren’t always connected at the time of each build. If your Windows partition is not BitLockered, then they won’t be cached, in which case make sure the volume you want auto-unlocked is connected at each Rescue Media build.