Other than the same issue everyone has with authenticating steam, strangely I get this message when trying to authenticate my PS4 account. "Authentication Error The account you attempted to verify is not linked to your currently logged in account. Please try again with your linked account for this platform." Then I try to go to my profile to see what PS4 account is linked to my account and it doesn't tell me. So I tried to unlink my PS4 account entirely to re-link it hoping that would solve the issue and I get the following message, "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." I am at a loss currently as to what to do looks like I'm stuck with my account like this.
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I had the same problem and got around it like this: https://www.bungie.net/en/Forums/Post/253288261?sort=0&page=0
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I basically have the same problem but with my battlenet account. The account I had linked had the wrong email address. Blizzard corrected that problem but now where I have cross save enabled I can’t unlink the blizzard account that has the wrong info on it and doesn’t exist anymore.