If you are referring to your Bungie.net profile display name, that won't automatically update in case of platform account name change. You'll need to do it manually in your profile Settings > About Me.
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That has already been changed. I changed my PSN account username, but it still shows the old username in the cross save area, as well as on third party sites. Is it not possible to have that changed without deactivating the cross save and re-doing it with the updated PSN account name?
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Have you logged on to your PS4 and played D2 after the name change?
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I have not, I can try to do that today, do you think that should fix it, or at least give me more info?
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It is possible that since you have not yet even logged into the game with the new name, it hasn't updated that info. It's my best guess.
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Once I do that, I will post an update.
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Did it work?
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Sounds good. Note that the change may not reflect immediately, so give it at least a few moments.