Greetings! We have SharePoint Online sites with SharePoint Designer 2013 workflows at our customers. A lot of our customers experiencing workflow errors now: the workflows just stopped working and if you try to start a new one manually, its Status remains "Not Started". All the running workflows have the same error:
System.Net.WebException: The request was aborted: The request was canceled. ---> System.InvalidOperationException: Failed to fetch an access token from the token service. For details, see the inner exception. ---> System.Net.WebException: The remote server returned an error: (401) Unauthorized.
at System.Net.HttpWebRequest.GetResponse()
at Microsoft.Activities.Hosting.Security.OAuthS2SSecurityTokenServiceCredential.FetchAccessToken(Uri stsUri, String targetServiceAudience, String authenticatorToken, HttpWebRequest request, TimeSpan timeout, EventTraceActivity eventTraceActivity, TimeSpan& expirationDuration)
--- End of inner exception stack trace ---
at Microsoft.Activities.Hosting.Security.OAuthS2SSecurityTokenServiceCredential.FetchAccessToken(Uri stsUri, String targetServiceAudience, String authenticatorToken, HttpWebRequest request, TimeSpan timeout, EventTraceActivity eventTraceActivity, TimeSpan& expirationDuration)
at Microsoft.Activities.Hosting.Security.OAuthS2SSecurityTokenServiceCredential.GetAccessTokenFromTokenService(OAuthS2SPrincipal client, OAuthS2SPrincipal targetServiceAudience, HttpWebRequest originalRequest, EventTraceActivity eventTraceActivity, TimeSpan& expirationDuration)
at Microsoft.Activities.Hosting.Security.OAuthS2SSecurityTokenServiceCredential.GetAuthorization(OAuthS2SAuthenticationChallenge[] bearerChallenges, HttpWebRequest request, EventTraceActivity eventTraceActivity)
at Microsoft.Activities.Hosting.Security.OAuthS2SAuthenticationModule.AuthenticateInternal(String challenge, WebRequest request, OAuthS2SCredential credential, EventTraceActivity eventTraceActivity)
at Microsoft.Activities.Hosting.Security.OAuthS2SAuthenticationModule.Authenticate(String challenge, WebRequest request, ICredentials credentials)
at System.Net.AuthenticationManagerDefault.Authenticate(String challenge, WebRequest request, ICredentials credentials)
at System.Net.AuthenticationState.AttemptAuthenticate(HttpWebRequest httpWebRequest, ICredentials authInfo)
at System.Net.HttpWebRequest.CheckResubmitForAuth()
at System.Net.HttpWebRequest.CheckResubmit(Exception& e, Boolean& disableUpload)
at System.Net.HttpWebRequest.DoSubmitRequestProcessing(Exception& exception)
at System.Net.HttpWebRequest.ProcessResponse()
at System.Net.HttpWebRequest.SetResponse(CoreResponseData coreResponseData)
--- End of inner exception stack trace ---
at Microsoft.Workflow.Common.AsyncResult.End[TAsyncResult](IAsyncResult result)
at Microsoft.Activities.Hosting.HostedHttpExtension.HttpRequestWorkItem.OnEndComplete(ScheduledWorkItemContext context, IAsyncResult result)
Are there any problems with the workflow engine? Is Microsoft aware of this issue?
Thank You!
