Troubleshoot multiple devices with the same 100.x IP address
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Multiple devices with the same 100.x IP address can occur if you use a backup of one device to create another, or clone a file system from one device to another. The Tailscale configuration files are duplicated. The Tailscale files will need to be removed from one of the two.
You can identify duplicated devices in the Machines page of the admin console by looking for a Duplicate node key badge underneath the device name.
On one of the systems, uninstall and completely delete the Tailscale client. For more information, refer to Uninstall Tailscale. It is especially important to remove the files listed for your platform, the goal is to make a new Tailscale IP address when it is installed again. Then, reinstall the Tailscale client, by following the instructions at Install Tailscale.