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Publish this TXT record at your DNS provider, then Check DNS and Activate. The current key keeps signing until the new one is activated.

Add a second factor with an authenticator app (Google Authenticator, Authy, 1Password…).

1. Add this key to your authenticator app (type the secret, or turn the URI into a QR code):

2. Save these recovery codes — each works once if you lose your device. They are shown only now.