hi
I deployed the MBAM, and tested 10 clients, three clients cannot encrypt, others are ok ; in that PCs there are a forced pop-up encryption window
.but failed
the event ID 2,details Null, do you meet this issue?

hi
I deployed the MBAM, and tested 10 clients, three clients cannot encrypt, others are ok ; in that PCs there are a forced pop-up encryption window
.but failed
the event ID 2,details Null, do you meet this issue?

Since only three clients has issue, please confirm the OS builds of them, upgrade them to the same version of Windows 10 as other normal computers.
From my search the Microsoft Windows 10 1903 release broke the Microsoft Bitlocker Administration and Monitoring (MBAM) agent, so if your three clients are using 1903, you need to apply the MBAM2.5_Client_x64_KB4505175 patch for fix, but now this patch cannot be downloaded. 
https://support.microsoft.com/en-us/topic/may-2019-servicing-release-for-microsoft-desktop-optimization-pack-53df7972-c633-bada-950d-4afe6574ed84
Therefore, you need to upgrade system on those 1903 clients.
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