Quick Login – Roblox Support
https://en.help.roblox.com/hc/en-us/articles/360056582012-Quick-Login
WEBTo log in, you will need to follow the two sets of directions. Generate A One-Time Code. On your new device, open the login page. Click the Log In with Another Device button. A one-time code will be displayed, which is only valid for 5 minutes. Authenticate The One-Time Code. On your logged-in device, go to Account Settings then Quick Login.
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