Compute the response from the challenge below and your secret, then enter it.
Challenge
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Scan it, or copy it. Single use, valid 5 minutes, and spent on any attempt - right or wrong. The code is lowercase letters and digits only, with nothing wrapped around it.
Invalidates every admin session everywhere. Restricted to the Archistructure account.
The same credentials work as a JSON POST for the iPhone shortcut: nonce, username, password. Sessions last while the tab is open, then 15 minutes.
Response is SHA-256(username + nonce + secret) as lowercase hex.