As here the user is alt banned:
Reproduction step:
Use your main on normal roblox application
Get roblox from microsoft app
System Information:
Windows 11 pro 24H2
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It worked before?
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yes it did, its the reason there are many video on youtube of mac spoofer to try to bypass the system.
Did a similar test just a few days ago with a friend. Only 9% of his alts were detected. Reproduction was simply to log out and log into an alt and join the game. Feels like it has been broken forever.
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Alt accounts are not identified based on IP address, it is not a IP ban at all.