I live on a busy street. When a person walks past my house and their mobile device is set to Ask to Join Networks = Notify, I will get an email from TP-LINK Cloud that "UNKNOWN has joined the Home’s network."

This email is very light on details, and doesn't tell me the IP or MAC address of the UNKNOWN device, but I have checked every MacOS, Windows, Android, and iOS device in the house and disabled any MAC randomization feature.

When I login the Deco iOS app, and scroll through the list of Offline Devices, there are pages and pages and pages of UNKNOWN devices. I would estimate over 250 UNKNOWN devices.

Testing

I am able to reproduce the behaviour using these steps:

1. A mobile device with iOS15+
2. Settings > Wi-Fi > Ask to Join Networks set to Notify (Default configuration) or ASK
3. Wi-Fi > Mac Address Randomisation set to ON (Default configuration)
4. Forget any existing Wi-Fi networks
5. Restart the device.
6. Once the device restarts you will get a New Device Connected email or push notification. 

Questions

1. How can I remove all of these unknown devices? Going through one by one is very tedious. Is there a DELETE ALL option?
2. Is there a maximum limit of unknown devices before there is a negative effect on the operation of the DECO unit?
3. How can I stop UNKNOWN devices from appearing in the list of Offline devices.
4. How can I turn off the email warning?

Device Configuration:

2 x M9Plus(2.0) - 1.5.1 Build 20210126 Rel. 59387

1 x M5(3.0) - 1.5.7 Build 20210819 Rel. 43499