Below is a current snipped from a non working machines windows update log.
2025/10/22 15:30:01.8742036 1372 1160 DownloadManager Download manager restoring 0 downloads
2025/10/22 15:30:01.8745029 1372 1160 Agent CPersistentTimeoutScheduler | GetTimer, returned hr = 0x00000000
2025/10/22 15:30:01.8754842 1372 1160 IdleTimer IdleTimer::NetworkStateChanged. Network connected? Yes
2025/10/22 15:30:01.8812940 9900 7212 Test AUTest.cab validation: Test keys are not allowed
2025/10/22 15:30:01.8813447 9900 7212 ComApi * START * Federated Search ClientId = Windows Defender (cV: C6ofe7yQk0uBGJWX.1.0)
2025/10/22 15:30:01.8820280 1372 6496 IdleTimer WU operation (SR.Windows Defender ID 1) started; operation # 6; does use network; is not at background priority
2025/10/22 15:30:01.8820291 1372 6496 IdleTimer Activate PDC state for AllNetworks
2025/10/22 15:30:01.8822380 1372 6496 IdleTimer Incremented PDC RefCount for Network to 1
2025/10/22 15:30:01.8823934 1372 2396 Agent Processing auto/pending service registrations and recovery (cV: C6ofe7yQk0uBGJWX.1.0.0.0)
2025/10/22 15:30:01.8860176 1372 11124 DownloadManager Received power state change notification: Old: <unknown>; New: AC.
2025/10/22 15:30:01.8860211 1372 11124 DownloadManager Power state changed from <unknown> to AC.
2025/10/22 15:30:01.9093953 1372 2396 SLS Get response for service 9482F4B4-E343-43B6-B170-9A65BC822C77 - forceExpire[False] asyncRefreshOnExpiry[False]
2025/10/22 15:30:01.9093987 1372 2396 SLS path used for cache lookup: /SLS/{9482F4B4-E343-43B6-B170-9A65BC822C77}/x64/10.0.22631.3007/0?CH=763&L=en-US&P=&PT=0x30&WUA=1023.1020.2192.0&MK=LENOVO&MD=11CES01P00
2025/10/22 15:30:01.9094799 1372 2396 SLS Retrieving SLS response from server...
2025/10/22 15:30:01.9121650 1372 2396 SLS MS-CV header: MS-CV: C6ofe7yQk0uBGJWX.1.0.0.3
2025/10/22 15:30:01.9123424 1372 2396 SLS Making request with URL
HTTPS://slscr.update.microsoft.com/SLS/{9482F4B4-E343-43B6-B170-9A65BC822C77}/x64/10.0.22631.3007/0?CH=763&L=en-US&P=&PT=0x30&WUA=1023.1020.2192.0&MK=LENOVO&MD=11CES01P00 and send SLS events, cV=C6ofe7yQk0uBGJWX.1.0.0.2.
2025/10/22 15:30:02.4235289 1372 2396 Misc *FAILED* [80072F8F] Send request
2025/10/22 15:30:02.4235401 1372 2396 Misc *FAILED* [80072F8F] WinHttp: SendRequestToServerForFileInformation (retrying with default proxy)
2025/10/22 15:30:02.7893280 1372 2396 Misc *FAILED* [80072F8F] Send request
2025/10/22 15:30:02.7893359 1372 2396 Misc *FAILED* [80072F8F] Library download error. Will retry. Retry Counter:0
2025/10/22 15:30:03.1564241 1372 2396 Misc *FAILED* [80072F8F] Send request
2025/10/22 15:30:03.1564325 1372 2396 Misc *FAILED* [80072F8F] WinHttp: SendRequestToServerForFileInformation (retrying with default proxy)
2025/10/22 15:30:24.2039457 1372 2396 Misc *FAILED* [80072EE2] Send request
2025/10/22 15:30:24.2039928 1372 2396 Misc *FAILED* [80072EE2] Library download error. Will retry. Retry Counter:1
2025/10/22 15:30:45.2621855 1372 2396 Misc *FAILED* [80072EE2] Send request
2025/10/22 15:30:45.2621928 1372 2396 Misc *FAILED* [80072EE2] WinHttp: SendRequestToServerForFileInformation (retrying with default proxy)
2025/10/22 15:31:06.3355060 1372 2396 Misc *FAILED* [80072EE2] Send request
2025/10/22 15:31:06.3355129 1372 2396 Misc *FAILED* [80072EE2] Library download error. Will retry. Retry Counter:2
2025/10/22 15:31:27.3971670 1372 2396 Misc *FAILED* [80072EE2] Send request
2025/10/22 15:31:27.3971764 1372 2396 Misc *FAILED* [80072EE2] WinHttp: SendRequestToServerForFileInformation (retrying with default proxy)
2025/10/22 15:31:27.7252905 1372 2396 Misc *FAILED* [80072F8F] Send request
2025/10/22 15:31:27.7253206 1372 2396 SLS Complete the request URL
HTTPS://slscr.update.microsoft.com/SLS/{9482F4B4-E343-43B6-B170-9A65BC822C77}/x64/10.0.22631.3007/0?CH=763&L=en-US&P=&PT=0x30&WUA=1023.1020.2192.0&MK=LENOVO&MD=11CES01P00 with [80072F8F] and http status code[0] and send SLS events.
2025/10/22 15:31:27.7253882 1372 2396 SLS *FAILED* [80072F8F] GetDownloadedOnWeakSSLCert
2025/10/22 15:31:27.7258501 1372 2396 SLS *FAILED* [80072F8F] Method failed [CSLSClient::GetResponse:700]
2025/10/22 15:31:27.7267443 1372 2396 Agent *FAILED* [80072F8F] file = C:\__w\1\s\src\Client\lib\EndpointProviders\EndpointProviders.cpp, line = 2162
2025/10/22 15:31:27.7267576 1372 2396 Agent *FAILED* [80072F8F] file = C:\__w\1\s\src\Client\lib\EndpointProviders\EndpointProviders.cpp, line = 1706
2025/10/22 15:31:27.7267674 1372 2396 Agent *FAILED* [80072F8F] file = C:\__w\1\s\src\Client\lib\EndpointProviders\EndpointProviders.cpp, line = 1722
2025/10/22 15:31:27.7267861 1372 2396 Agent *FAILED* [80072F8F] Method failed [CAgentServiceManager:

etectAndToggleServiceState:3021]
2025/10/22 15:31:27.7267918 1372 2396 Agent *FAILED* [80072F8F] SLS sync failed during service registration.
2025/10/22 15:31:27.7306429 1372 2396 Agent Total possible federated services: 1 (cV: C6ofe7yQk0uBGJWX.1.0.0.0)
2025/10/22 15:31:27.7306505 1372 2396 Agent Candidate federated service 9482F4B4-E343-43B6-B170-9A65BC822C77 (cV: C6ofe7yQk0uBGJWX.1.0.0.0)
2025/10/22 15:31:27.7306570 1372 2396 Agent Federated service 9482F4B4-E343-43B6-B170-9A65BC822C77 is not added due to an associated SLS registration failure (cV: C6ofe7yQk0uBGJWX.1.0.0.0)