I have a production farm that is not highly available, consisting of one front-end server (1FED) and one application server (1APPS). I also have a Workflow Manager server. Workflows that were created using SharePoint Designer were working properly, but suddenly, one of the workflows that contain various HTTP request actions to create a subsite and groups encountered an error. The error message indicated that the site was already created as if the create subsite action had timed out, and the workflow was trying to trigger the same action again. After reviewing the ULS logs, I found the only error message: "Microsoft.Workflow.Client.AuthenticationException: Authentication Failed." This workflow fails approximately three times out of ten. I am wondering if increasing the "MaxServiceOperationTimeout" in the Workflow Manager would be helpful, and how to resolve the authentication failure issue.
SharePoint Server
A family of Microsoft on-premises document management and storage systems.