Hi there,
If you can not enable Bitlocker then you can then try troubleshooting MDT .
Troubleshooting Reference for the Microsoft Deployment Toolkit
https://learn.microsoft.com/en-us/troubleshoot/mem/configmgr/troubleshooting-reference
You can also try enabling the Bitlocker suing the Windows intune .Use one of the following policy types to configure BitLocker on your managed devices
-Endpoint security disk encryption policy for BitLocker.
-Device configuration profile for endpoint protection for BitLocker.
You can dig more info from here https://learn.microsoft.com/en-us/mem/intune/protect/encrypt-devices#silently-enable-bitlocker-on-devices
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