About WatchGuard Cloud Verification Codes
https://www.watchguard.com/help/docs/help-center/en-US/Content/en-US/WG-Cloud/Devices/verification_code_about.html
When you add a Firebox to WatchGuard Cloud, you might be required to copy a Verification Code. The Firebox uses the Verification Code to register to your WatchGuard Cloud account. The Verification Code is unique to the Firebox, and expires after 30 days. If your Firebox has a TPM (Trusted Platform Module) chip, and runs Fireware v12.5.3 or higher, the Firebox uses TPM to …
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