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Your user profile is private by default and won't be visible to users outside Discord, if you want to be visible in the web forum you can add the "Public Profile" role in <id:customize>
You can mark a message as the answer for your post with Right click -> Apps -> Mark SolutionRight click -> Apps -> Mark Solution (if you don't see the option, try refreshing Discord with Ctrl + R)
I'd recommend checking your request against the expectations in the Discord API docs for that endpoint. 400 means the request wasn't made correctly in most cases.
Also if you could provide some context as to what you're trying to accomplish, we may be able to point you in the right direction