Sorry but no.
To remove a account you need to deactivate cross save (with the 90 day cooldown period before you can reactivate) and authenticate all linked accounts.
As the authentication system is there for security reasons Bungie will not remove the account for you for any reason.
Please do a search for "Cross save issues" on Bungie.net or the Destiny app to bring up a help guide which covers this.
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That sucks. I am not too worried as I normally play on Steam anyways, but I didn't want my Xbox account to be stuck if I so far can't even recover it. Thanks for helping me though