Send the link below to your phone or tablet over AirDrop / iMessage. Opening it auto-fills the auth page and authorizes the device in one tap.
Includes the token in the URL fragment (the bit after #) — fragments never reach the server, so the token doesn't show up in any access log.
Paste this manually on the device's /auth page if the link can't be opened (e.g. iMessage strips the fragment).
When WhatsApp asks to relink, scan the QR from this Mac. The QR is local-only and is not exposed through the public dashboard URL.