It could be that you run in some issues with FSAMigrator.
Make sure you have copied Example EVFileSvrArcMngr.exe.config to EVFileSvrArcMngr.exe.config and restarted the task controller services.
Then try and call the API via IE with:

{0} - http or https
{1} - server
{2} - port - normally 80 for http, 443 for https
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