The problem went away on its own today, without any upgrade. Was it Microsoft's fault in the end?
What error for?
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(198.4, 16%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJY%3C/text%3E%3C/svg%3E)
jamie younkin
325
Reputation points
Today I got this error and I don't know what it's for and I want to know how to fix it if it keeps popping up again in the event viewer?
SCEP Certificate enrollment for Local system via https://INTC-KeyId-[Moderator Note: Personal Info Removed].microsoftaik.azure.net/templates/Aik/scep failed:
SubmitDone
Submit(Request): Too Many Requests
HTTP/1.1 429 Too Many Requests
Date: Wed, 15 Jul 2026 16:37:03 GMT
Content-Length: 17
Content-Type: text/HTML
Retry-After: 20
client-request-id: [Moderator Note: Personal Info Removed]
Method: POST(719ms)
Stage: SubmitDone
Error 0x801901ad (-2145844819)
Windows for home | Windows 11 | Performance and system failures
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jamie younkin 325 Reputation points
2026-07-15T17:34:15.56+00:00 I am also getting this error now and I tried the DISM and SFC commands and nothing fixes them. SCEP Certificate enrollment for WORKGROUP[Moderator Note: Personal Info Removed] via https://INTC-KeyId-[Moderator Note: Personal Info Removed].microsoftaik.azure.net/templates/Aik/scep failed:
PkiStatus(11): SCEPDispositionPendingChallenge
EnrollStatus(32): EnrollUnknown
The operation completed successfully. 0x0 (WIN32: 0)
SubmitDone
Submit(ChallengeAnswer): Too Many Requests
HTTP/1.1 429 Too Many Requests
Date: Wed, 15 Jul 2026 17:27:00 GMT
Content-Length: 17
Content-Type: text/HTML
Retry-After: 20
client-request-id: [Moderator Note: Personal Info Removed]
Method: POST(3265ms)
Stage: SubmitDone
Error 0x801901ad (-2145844819)
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(140.8, 85%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EHH%3C/text%3E%3C/svg%3E)
HP HANSORA 60 Reputation points2026-07-16T10:44:50.85+00:00 SCEP Certificate enrollment for Local system via https://INTC-KeyId-[Moderator Note: Personal Info Removed].microsoftaik.azure.net/templates/Aik/scep failed:
SubmitDone
Submit(Request): Too Many Requests
HTTP/1.1 429 Too Many Requests
Date: Thu, 16 Jul 2026 10:12:15 GMT
Content-Length: 17
Content-Type: text/HTML
Retry-After: 20
client-request-id: [Moderator Note: Personal Info Removed]
Method: POST(1437ms)
Stage: SubmitDone
Error 0x801901ad (-2145844819)
i also get erron from 15-7-26 after getting above windows update i have uploaded update which is automaticaly updated.
is there any issue in update and is harmfull to system or not?
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(185.6, 70%, 27%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EL%3C/text%3E%3C/svg%3E)
LoveYou 0 Reputation points2026-07-16T19:40:12.8533333+00:00 This error appears after the last update. And it appears every time you restart.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(249.60000000000002, 12%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ECN%3C/text%3E%3C/svg%3E)
Clary-N 12,680 Reputation points Microsoft External Staff Moderator2026-07-17T05:53:58.38+00:00 Hi all,
Thank you for providing the additional details. Since the issue started after a recent Windows update and running DISM and SFC did not resolve it, you may want to consider performing an in-place repair upgrade of Windows. This process reinstalls Windows while keeping your personal files, apps, and settings intact and can help repair Windows components that may have been affected by the update.
You can perform the repair upgrade by:
- Downloading the latest Windows 11 Installation Assistant or ISO from the Windows 11 download page.
- Running Setup.exe from within Windows.
- Selecting Keep personal files and apps when prompted.
- Completing the installation and allowing the device to restart.
*Disclaimer: Let’s try performing an in-place install or in-place upgrade which will refresh your Windows files and operating system without removing files or applications. That being said, we always recommend that if you have important data, you should back it up before making large system changes. If you want to back up your data first, please do so.
If the CertificateServicesClient-CertEnroll Event ID 87 errors continue to appear after the repair installation, I recommend contacting Microsoft Support for further investigation. There are reports from other users experiencing the same HTTP 429 (Too Many Requests) and 0x801901ad errors following recent Windows updates, which may indicate a broader issue rather than a problem specific to your device. Microsoft Support may be able to confirm whether this is a known issue and advise on any available fixes or workarounds.
Please let me know the results.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(220.8, 9%, 31%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EG%3C/text%3E%3C/svg%3E)
Greg 0 Reputation points2026-07-17T12:58:01.5133333+00:00 Since Windows update I have the exact same issue. Causes multiple crashes per day. DISM didn't fix it.
Tried to disable the service, didn't resolve it.
Rolled back the update, reinstalled it, installed optional updates, updated drivers and apps. Still doing it.
Def Windows update related. -
LoveYou 0 Reputation points
2026-07-17T16:45:07.91+00:00 in-place repair upgrade of Windows no solve the problem
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Clary-N 12,680 Reputation points Microsoft External Staff Moderator
2026-07-18T01:00:26.35+00:00 Hi all,
Thank you for the update. If the in-place repair upgrade did not resolve the issue, it is less likely that the problem is caused by corrupted Windows system files.
As the issue has persisted after DISM, SFC and an in-place repair upgrade, I recommend contacting Microsoft Support for further investigation. You may also want to submit feedback through Feedback Hub (Win + F) and include the relevant Event Viewer logs, as this can help Microsoft investigate whether the issue is related to a broader problem introduced by recent updates.
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3 answers
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LoveYou 0 Reputation points
2026-07-18T10:17:40.0266667+00:00 The problem went away on its own today, without any upgrade. Was it Microsoft's fault in the end?
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Clary-N 12,680 Reputation points Microsoft External Staff Moderator
2026-07-16T00:36:50.99+00:00 Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.
Hi jamie younkin,
Thank you for providing the Event Viewer details.
Based on the information you've shared, this appears to be related to a SCEP (Simple Certificate Enrollment Protocol) certificate enrollment attempt that is receiving an HTTP 429 "Too Many Requests" response from the Microsoft AIK certificate enrollment service. The error code 0x801901ad corresponds to that server response rather than indicating corruption of Windows system files.
Because this is a certificate enrollment process contacting an external Microsoft service, running DISM and SFC would not typically resolve this type of event. At this time, there is no indication from the error itself that Windows is damaged or that your system is at risk.
To better understand whether any action is needed, could you let us know:
- Which Windows 11 version and build you are running (Press Windows key + R and type "winver")?
- Is this error occurring repeatedly or have you only seen it once or twice?
- Have you noticed any issues with Windows Update, Device Security, TPM, BitLocker or device encryption?
In the meantime, please make sure your system is fully up to date, including any optional driver and firmware updates available through Windows Update. If the event appears only occasionally and your device is otherwise working normally, it may be reasonable to simply monitor it and see whether it continues to occur after future Windows updates.
Please let me know the results and I'll be happy to take a closer look.
If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
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jamie younkin 325 Reputation points
2026-07-16T00:55:57.0433333+00:00 I don't know if the new update that came out yesterday cause this to happen.
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Clary-N 12,680 Reputation points Microsoft External Staff Moderator
2026-07-16T08:10:50.7566667+00:00 Hi jamie younkin,
Thank you for the update. It's possible the recent update is related, but I can't confirm that based on the information available.
Could you please review the questions in my previous reply and provide as much detail as possible? This will help determine whether further action is needed.
If everything is working normally and this is only an occasional Event Viewer entry, it may be worth monitoring for now to see whether it continues after future updates.
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Clary-N 12,680 Reputation points Microsoft External Staff Moderator
2026-07-17T08:25:29.5833333+00:00 Hi jamie younkin,
May I know if you have got any chance to check my answer?
I am glad to help if you have any other questions.
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