What is my recovery key, and how do I keep it safe?

Your recovery key is your account key written out as WW1- and eleven groups of five letters and numbers. To see it, go to Settings → Account → Show Recovery Key; your phone asks for Face ID, Touch ID, your passcode, or your screen lock first when one is set. Copy it into a password manager, or share it to a private note or print it, and keep it somewhere only you can reach. Anyone who has it has your account, including your Buddies, so don't send it to other people or post it. If you lose it, view it again on any phone that still uses your account. If you think someone else has it, delete your Buddies data (Buddies Settings → Delete My Buddies Data): that removes your buddies and gives you a new account and recovery key. If you lose every phone and the key, no one can recover the account, including us.