Problem: BitLocker Cant Encrypt the Drive Access Is Denied
BitLocker is a Windows security feature.
However, sometimes you cannot encrypt a drive with BitLocker due to the access is denied error.
How to Fix BitLocker Cant Encrypt the Drive Access Is Denied
Fix 1.
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So, the first thing you better do is to ensure BDESVC is enabled.
In the Windows search box, typeservicesand clickServicesfrom the best match result.
Find and double-clickBitLocker Drive Encryption Service.

In the new window, select theAutomaticoption from the Startup throw in drop-down menu.
ClickApplyandOKsequentially to make this change take effect.
Fix 2.
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Standard users only can turn on, turn off, or change configurations of BitLocker on removable data drives.
(5 Methods).
Fix 3.
This post describes how to change partition to primary using diskpart and a diskpart alternative partition management tool.
If there are other effective ways available, welcome to send an email to[email protected].
Thank you in advance.