SharePoint 2013 - 4 server farm with 2 WFE. We recently migrated all our users to a different domain while the farm remained in it's existing domain. We used the Move-SPUser command to migrate our users. Everything seems to be ok now but for one weird issue.
Every so often a user will be prompted for their username and password. This will be while trying to upload a document, publish a workflow or action a task. It almost never works to enter the details, if we simply try again one or two more times, it works. If we hit cancel on the prompt we get a 401 Unauthorized error.
What could be causing this issue? What type of logging should I be doing to try and capture it as right now nothing is showing up in the logs.