topic Re: Windows OS Startup Failure After Full-Disk Encryption Agent Installation - Unable to Authenticat in Endpoint

Windows OS Startup Failure After Full-Disk Encryption Agent Installation - Unable to Authenticate

AXP — Wed, 12 Nov 2025 21:46:32 GMT

I have two system that I am not able to gain access.here problem one

I am not able to complete the the sign-in process after system restart.

History

system was Win X

uninstall CPEP completely

upgrade system to Win X1

re-installed CPEP

restarted system to complete the process - but my creds are not accepted. so remote help was working. How do I get around this problem

Re: Windows OS Startup Failure After Full-Disk Encryption Agent Installation - Unable to Authenticat

the_rock — Wed, 12 Nov 2025 23:49:32 GMT

When you say unable to authenticate...how exactly? Windows creds or something else?

Re: Windows OS Startup Failure After Full-Disk Encryption Agent Installation - Unable to Authenticat

PhoneBoy — Wed, 12 Nov 2025 23:52:01 GMT

What version of CPEP is being installed on what version of Windows 11?

Re: Windows OS Startup Failure After Full-Disk Encryption Agent Installation - Unable to Authenticat

AXP — Thu, 13 Nov 2025 15:33:23 GMT

CPEP pre-boot user creds - you can not get to windows until you get pass cpep first time sign-in. I also the basic remote option but they failed as well. I can see myself listed the pre-boot user list. CPEP E88 86.8.80.15

Re: Windows OS Startup Failure After Full-Disk Encryption Agent Installation - Unable to Authenticat

AXP — Thu, 13 Nov 2025 15:33:32 GMT

CPEP E88 86.8.80.15

Re: Windows OS Startup Failure After Full-Disk Encryption Agent Installation - Unable to Authenticat

the_rock — Thu, 13 Nov 2025 15:53:22 GMT

Maybe try newest one, E89.05

Re: Windows OS Startup Failure After Full-Disk Encryption Agent Installation - Unable to Authenticat

PhoneBoy — Thu, 13 Nov 2025 16:03:34 GMT

You didn't specify what edition of Windows 11 you are attempting to install this on.
It's also not clear what actual release "86.8.80.15" corresponds to.
However, I'm fairly certain it's not E89.05, which is the only version that would be supported on Windows 11 25H2 (albeit as Early Availability).
See sk115192.

Bottom line: you will need to get an updated installer from your administrator.

Re: Windows OS Startup Failure After Full-Disk Encryption Agent Installation - Unable to Authenticat

AXP — Thu, 13 Nov 2025 20:29:01 GMT

no it is not E89 that just came out, this system had been powered down for a few months.

Re: Windows OS Startup Failure After Full-Disk Encryption Agent Installation - Unable to Authenticat

the_rock — Thu, 13 Nov 2025 20:31:16 GMT

Its still worth testing, in my opinion.

Re: Windows OS Startup Failure After Full-Disk Encryption Agent Installation - Unable to Authenticat

AXP — Fri, 14 Nov 2025 17:38:33 GMT

I am not sure how you would do you do that if you can not past the start up boot screen.

Re: Windows OS Startup Failure After Full-Disk Encryption Agent Installation - Unable to Authenticat

PhoneBoy — Mon, 17 Nov 2025 15:28:02 GMT

The point is that this version of our Endpoint client is not compatible with the version of Windows 11 you are likely running on.
Unless you can boot into safe mode and uninstall the client (which will require the uninstall password set by the Endpoint admin), this is probably going to require reimaging your PC.