Warp-cli not working on latest Ubuntu LTS?

I’ve followed all instructions to setup WARP on the latest Ubuntu LTS, and it is said I should check for the line warp=on, but nothing is written about possible causes for warp=off. Checking journalctl, I see:

ago 12 22:24:06 ideapad NetworkManager[849]: <info>  [1628817846.0443] manager: (CloudflareWARP): new Tun device (/org/freedesktop/NetworkManager/Devices/4)
ago 12 22:24:06 ideapad systemd-udevd[3052]: CloudflareWARP: Failed to get link config: No such device
ago 12 22:24:06 ideapad warp-svc[889]: [Debug] No cached session for DNSNameRef("a.nel.cloudflare.com")
ago 12 22:24:06 ideapad warp-svc[889]: [Debug] Not resuming any session
ago 12 22:24:06 ideapad warp-svc[889]: [Debug] Connect finished Err(Os { code: 13, kind: PermissionDenied, message: "Permission denied" })
ago 12 22:24:06 ideapad warp-svc[889]: [Error] Connection error
ago 12 22:24:06 ideapad warp-svc[889]: [Debug] WARP status: Disconnecting

Any ideas? I guess Ubuntu Focal is supported, since the official repository has an entry specifically for it…?

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