I have done a lot of digging around and found some errors in WindowsUpdateLog
2019/10/08 09:00:19.5222730 11236 9480 WebServices Auto proxy settings for this web service call.
2019/10/08 09:00:19.6399999 11236 9480 WebServices WS error: There was an error communicating with the endpoint at '
http://REDACTED:8530/SimpleAuthWebService/SimpleAuth.asmx'.
2019/10/08 09:00:19.6400026 11236 9480 WebServices WS error: The server returned HTTP status code '407 (0x197)' with text 'authenticationrequired'.
2019/10/08 09:00:19.6400042 11236 9480 WebServices WS error: The proxy requires HTTP authentication scheme 'NTLM'.
2019/10/08 09:00:19.6402456 11236 9480 WebServices Auto proxy settings for this web service call.
2019/10/08 09:00:19.8919014 11236 9480 WebServices WS error: There was an error communicating with the endpoint at '
http://REDACTED:8530/SimpleAuthWebService/SimpleAuth.asmx'.
2019/10/08 09:00:19.8919069 11236 9480 WebServices WS error: The server returned HTTP status code '502 (0x1F6)' with text 'notresolvable'.
2019/10/08 09:00:19.8919103 11236 9480 WebServices WS error: The HTTP proxy was not able to reach the server.
2019/10/08 09:00:19.8920287 11236 9480 WebServices *FAILED* [80240438] Web service call
2019/10/08 09:00:19.8920317 11236 9480 WebServices Current service auth scheme=0.
2019/10/08 09:00:19.8920342 11236 9480 WebServices Current Proxy auth scheme=16.
2019/10/08 09:00:21.8930183 11236 9480 WebServices Auto proxy settings for this web service call.
2019/10/08 09:00:23.4692177 11236 9480 WebServices WS error: There was an error communicating with the endpoint at '
http://REDACTED:8530/SimpleAuthWebService/SimpleAuth.asmx'.
2019/10/08 09:00:23.4692241 11236 9480 WebServices WS error: The server returned HTTP status code '502 (0x1F6)' with text 'notresolvable'.
2019/10/08 09:00:23.4692278 11236 9480 WebServices WS error: The HTTP proxy was not able to reach the server.
2019/10/08 09:00:23.4693530 11236 9480 WebServices *FAILED* [80240438] Web service call
2019/10/08 09:00:23.4693563 11236 9480 WebServices Current service auth scheme=0.
2019/10/08 09:00:23.4693591 11236 9480 WebServices Current Proxy auth scheme=16.
2019/10/08 09:00:25.4701759 11236 9480 WebServices Auto proxy settings for this web service call.
2019/10/08 09:00:25.5154989 11236 9480 WebServices WS error: There was an error communicating with the endpoint at '
http://REDACTED:8530/SimpleAuthWebService/SimpleAuth.asmx'.
2019/10/08 09:00:25.5155044 11236 9480 WebServices WS error: The server returned HTTP status code '502 (0x1F6)' with text 'notresolvable'.
2019/10/08 09:00:25.5155079 11236 9480 WebServices WS error: The HTTP proxy was not able to reach the server.
2019/10/08 09:00:25.5156318 11236 9480 WebServices *FAILED* [80240438] Web service call
2019/10/08 09:00:25.5156349 11236 9480 WebServices Current service auth scheme=0.
2019/10/08 09:00:25.5156374 11236 9480 WebServices Current Proxy auth scheme=16.
2019/10/08 09:00:25.5156737 11236 9480 WebServices *FAILED* [80240438] Failed in NwsCallWithRetries( LGetAuthorizationCookie"
2019/10/08 09:00:25.5156890 11236 9480 ProtocolTalker *FAILED* [80240438] Method failed [CAuthorizationCookieWrapper::InitializeSimpleTargetingCookie:5840]
2019/10/08 09:00:25.5157102 11236 9480 IdleTimer WU operation (CAuthorizationCookieWrapper::InitializeSimpleTargetingCookie, operation # 19) stopped; does use network; is at background priority
2019/10/08 09:00:25.5161730 11236 9480 ProtocolTalker *FAILED* [80240438] Failed to initialize Simple Targeting Cookie
2019/10/08 09:00:25.5161840 11236 9480 ProtocolTalker *FAILED* [80240438] PopulateAuthCookies failed
2019/10/08 09:00:25.5161873 11236 9480 ProtocolTalker *FAILED* [80240438] RefreshCookie failed
2019/10/08 09:00:25.5162017 11236 9480 ProtocolTalker *FAILED* [80240438] RefreshPTState failed
2019/10/08 09:00:25.5162171 11236 9480 ProtocolTalker SyncUpdates round trips: 0
2019/10/08 09:00:25.5162205 11236 9480 ProtocolTalker *FAILED* [80240438] Sync of Updates
2019/10/08 09:00:25.5341253 11236 9480 ProtocolTalker *FAILED* [80240438] SyncServerUpdatesInternal failed
2019/10/08 09:00:25.5370413 11236 9480 Agent *FAILED* [80240438] Synchronize
2019/10/08 09:00:25.5728651 11236 9480 Agent * END * Finding updates CallerId = CcmExec, Id = 2, Exit code = 0x80240438 (cV = oCfx05vC0kGqY90Y.46.0.0.2)
2019/10/08 09:00:25.5753654 11236 9480 IdleTimer WU operation (CSearchCall::Init ID 2, operation # 18) stopped; does use network; is not at background priority
2019/10/08 09:00:25.5764461 9460 2176 ComApi *RESUMED* Search ClientId = CcmExec, ServiceId = 3DA21691-E39D-4DA6-8A4B-B43877BCB1B7 (cV = oCfx05vC0kGqY90Y.46.0.0)
2019/10/08 09:00:25.5794743 9460 2176 ComApi Exit code = 0x00000000, Result code = 0x80240438 (cV = oCfx05vC0kGqY90Y.46.0.0)
2019/10/08 09:00:25.5794820 9460 2176 ComApi * END * Search ClientId = CcmExec, Updates found = 0, ServiceId = 3DA21691-E39D-4DA6-8A4B-B43877BCB1B7 (cV = oCfx05vC0kGqY90Y.46.0.0)
2019/10/08 09:00:25.5797941 9460 13140 ComApi * END * All federated searches have completed. Jobs = 1, Succeeded = 0, ClientId = CcmExec (cV = oCfx05vC0kGqY90Y.46.1)
looks like the client (?) cannot connect to something called SimpleAuthWebService/SimpleAuth.asmx ? also looks like its using a proxy ! why would it do this, we dont use a proxy Perse (this will get confusing) we have a proxy for internet connections to all client machines but our sccm server has whitelisted SCCM websites and connects direct !