If you log into Windows 10 using a live account your documents folder is in this path:
This causes Minion to be unable to find ESO AddOns folder. I didn't see anything interesting in the log but it looks like it went and made a C:\users\<USER>\Documents folder with a minion.lnk file in it when it did the detection.
You can work around this by deleting the Documents folder minion created and then creating a symbolic directory link to link by running this command from a command prompt:
However it would be nice if that hack was not necessary. I suspect it will be beyond the abilities of a non-trivial number of users.
Also the default save location in settings is initially set to C:\Users\<USER>/.minion
(note the forward slash)
Every time I restart minion it forgets about ESO and prompts me to re-scan for games again. Clicking the "Reset tio Default" button changed the path to C:\users\<USER>\.minion and after doing this it works correctly.