If you've set up two-factor authentication on your account, you can now generate recovery codes as a backup way to sign in. These are handy if you ever lose access to your authenticator app — no need to email support to get back in.
Head to Settings → Sign in & security and you'll see a new "Recovery options" section underneath your authenticator devices. Click Generate to create a set of ten one-time codes. Each code can only be used once, and you can see how many you have left at any time.
If you run low or think your codes have been compromised, you can regenerate a fresh set — this replaces all existing codes, so any old ones stop working immediately.
Store your codes somewhere safe, like a password manager.