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“Security check failed or action not allowed” when adding a device?

“Security check failed or action not allowed” when adding a device?

Trying to add my Circle ringtone camera to Homekit again after several sources recommended resetting the device and I get this error every time. Can anyone with access to the accessory specifications explain to me what * exactly * this error means and what can be done to fix it? Logitech support has been unhelpful, with unnecessary recommendations to “restart the router,” “create a 2.4 GHz SSID,” and other things that aren’t relevant to the process at all.