Nothing can be deleted from your account while on Bungie.net.
If it is asking you authenticate a different account it means it is not the same one likes to your profile that you were originally playing on.
You may want to ensure you’re logging into steam won’t the correct credentials as well. It sounds like you’re logging in to the new account in game as well.
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yea it's to authenticate a different account on the same platform. so my original account with steam, is replaced with the new account on steam.
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Accounts cannot be replaced. Each account has its own unique login credentials. If you’re having trouble logging in to your original account you should reach out to steam customer support to help recover your credentials.
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It says. Destiny 2 has moved to steam! Your Destiny License have been transferred to Bose on Steam.