Unknown Mac Mini in device list
I was checking my device list and I have a device on there that I’ve never heard of it’s called a Mac mini I’ve never had anything with that name in it come from iTunes ?
[Re-Titled by Moderator]
Was this in connection with 'authorize' or 'deauthorize' your Mac(s)?
Hard to say; however if you used this information, that could be it..
• Authorize or de-authorize your computer for iTunes Store purchases - Apple Support
https://support.apple.com/en-us/HT201251
While it may not seem relevant, read through to see for certain.
Perhaps a former user or second admin account was involved.
Learn how to check your Apple ID device list to see where you're signed in and how to remove a device.
[Hard to say at this point.]
However your tag-line under recent post shows:
"Mac mini, macOS 10.13"