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."
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Which platform account did you use for signing in to Bungie.net when you saw that error?