Xbox account can't be linked to epic games account?

Following problem

I previously wanted to link my epicgames account to my Xbox live account but then it came that my Xbox account is already linked to another MMOGA account

but I don't remember ever connecting another account

do you know where i can look on the xbox what accounts are linked to my xbox live account?

and can you maybe tell me in general what I can do now?

So if you can't remember that you have already linked your Xbox Live account to another account, it may be that your account has been hacked. The best thing to do is go to Settings on Xbox and then go to Customization. There should be a category account. I think you can see what is connected. Haven't played Xbox for a long time. So it may be that something has changed.