Evil Twin False Alarm?

Today I received an Evil Twin alert that I connected to an access point with a new MAC Address. I’ve searched high and low, even using other network analysis tools, and I cannot find this “new” access point with that new MAC address anywhere in my network. You would think if I connected to a new access point that device would be in my “Things” listing, but it is NOT. Is this some type of false alarm?

And if I was able to find an access point with a new MAC address (which again I could not), it would be nice to have a feature to disable that device in some way.