There are other errors in the log which I believe relate to issue:
1. CompilerService
Invalid URL:
at OutSystems.Server.EventDispatcher.EventMessageValidator.Validate(String url, String authorizationHeader, String dateHeader, String listenerUniqueId)
at OutSystems.HubEdition.DeploymentController.Compiler.ValidateEventMessage(ICompilerContext context, String url, String authorizationHeader, String dateHeader, String listenerUniqueId, HEMessage& message)
2. TemplateManager
Invalid Authentication Token
at ssTemplateManager.CsRESTExpose.CsEventWatcherAPI.CsEventWatcherAPIControllerFlows.FlowEventWatcherAPIActionOnAuthentication(HeContext heContext)
at ssTemplateManager.CsRESTExpose.CsEventWatcherAPI.CsEventWatcherAPIController.OnFilter.OnAuthenticationImplementation(HttpActionContext actionContext, HttpRequestMessage httpRequestMessage, RestServiceApiController controller)
at OutSystems.RESTService.Filters.AbstractFilter.OnRequest(HttpActionContext actionContext, HttpRequestMessage httpRequestMessage, RestServiceApiController controller)