Hello,
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Does the Google Fiber have the public IP? Dynamic IP as well as ok.
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When you are testing the VPN connection, please connect Slate 7 to your phone hotspot through repeater to simulate a remote location.
Slate 7 cannot be connected to Flint 2 or Google Fiber 's LAN. -
Please refer to these docs to check again:
Build your own WireGuard home server - GL.iNet Router Docs 4
How to troubleshoot WireGuard
If the issue still exists, please PM me the issue syslog.