Device add error email. Unknown device.

I received an email about an error that SupportAssist encountered.

"We attempted to add devices today. However, the following errors occurred. SupportAssist must be able to communicate with these devices in order to provide the greatest value. Please resolve the issues below to complete the device add process."

The tag number of the device listed in the error is not known to me and it is not part of our network. .  Why is this unknown device trying to add itself to SupportAssist on my server?