Have you tried logging out of your account on your other devices?
https://www.howtogeek.com/how-to-fix-roblox-error-code-264/?utm_source=dlvr.it&utm_medium=blogger
https://www.howtogeek.com/how-to-fix-roblox-error-code-264/?utm_source=dlvr.it&utm_medium=blogger