Try support:
https://en.help.roblox.com/hc/en-us/articles/360000334603-Xbox-App-Trouble-Linking-Roblox-Account
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Hello. I can't log in to my account on the windows device. I have written "Incompatible accounts, this Roblox account is already linked to a different account on Xbox network". At the same time, I don't have an Xbox, but I can log in to this account using the same password on my phone. What do I need to do?
Please help me.