Troubleshoot Firebox Connections to WatchGuard Cloud
https://www.watchguard.com/help/docs/help-center/en-US/Content/en-US/WG-Cloud/Devices/device_troubleshoot.html
To register to your WatchGuard Cloud account, the Firebox sends the WatchGuard Cloud Verification Code. A problem with the connection or the Verification Code can cause a registration error. If your Firebox has a TPM (Trusted Platform Module) chip, and runs Fireware v12.5.3 or higher, the Firebox uses TPM to register with WatchGuard Cloud.
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