I have removed my old xbox account and I can't unlink it. I don't know what else to do except writing about it here. "Authentication Error Unlinking has failed because you signed into a different external account than the one you have linked. We cannot unlink your external account unless you sign into the correct account.Unlinking has failed because you signed into a different external account than the one you have linked. We cannot unlink your external account unless you sign into the correct account."