The Steam account linked to your Bungie profile does not have a Steam Community profile page, which usually indicates that it is a newly created account that has not been fully setup. More than likely what has occurred, is that the incorrect login info was used when you were trying to link your Steam account during the cross-save activation process, which actually created a new account. You will want to contact Steam support, and request assistance with recovering the login credentials for the following account: jaxbriggsoia (ID: 76561198986146024) When contacting Steam, there is no need to mention Bungie, Destiny, or cross-save, as that can potentially confuse the support staff on what assistance is needed. Simply state that you created an account, and have forgotten the login info for that account. Once you have recovered the login info, you will be able to properly authenticate the currently linked Steam account. This will allow you to deactivate cross-save, if desired, so that you can unlink the erroneous account. You will still have to deal with the 90 day cooldown period for deactivating, and that cannot be avoided. It will apply to all platform accounts linked, not just the Steam account.
Hello. You can’t force unlink it. You need to contact steam support to help gain access to your account. If that is not possible, cross save cannot be deactivated.