Canon MF6180dw Manual page 410

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NOTE
If [Register] is unavailable
You need to enable Google Cloud Print. Click [Edit], select the [Use Cloud Printing] check box, click [OK], and then
restart the machine.
To register the machine again
If you need to register the machine again, such as if the owner of the machine changes, deregister the machine, then
register it again.
5
Click the link of the URL displayed for [URL for Registration].
6
Follow the on-screen instructions to register the machine.