What should I do before selling or giving away a device I used to sign in?

Remove it from your trusted-device list and sign out of the Seayora app on it. Signing out of the app also deletes the PIN or pattern stored on that handset, so nothing of yours is left behind.

From the guide Account Security: SSO, 2FA & Passkeys.

Device management

From your security settings you can see every device that has signed in to your account, with its approximate location and when it was last used, and remove any of them. Removing a device also forgets the network it last signed in from, so the next sign-in from there asks for a code again. Do this whenever you use a shared or public computer, or if you no longer recognize a listed device — and on a shared computer, untick “Remember me” before you sign in.

Read the whole guide: Account Security: SSO, 2FA & Passkeys

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