Sony KDL-55W900A - Manual (Page 165)

To display dialog when attempting to connect a device
with the TV
Activating this function can avoid an unintended device from being
connected.
When the standby screen for the Screen mirroring is displayed, press
the OPTIONS button, then select [Registration Notification] → [On].
Note that once you decline registration request from a device, you will
not be able to connect the device unless you delete it from the device
list.
To connect the declined device, press the OPTIONS button, select
[Show Device List / Delete], then delete the declined device. Then,
make a new connection with the device.
Notes
Connecting devices must conform to the following:
- Screen mirroring compatible devices: 2.4GHz connection (5GHz not
supported).
- Miracast compatible devices: 2.4GHz connection (5GHz not supported).
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