You can only use the main (active) cross-save account for app functions, as your other linked account(s) are inactive. So, in your case, you would need to use your Steam for any app features that involve using account info.
You can still log into the app using credentials of any linked account to access your Bungie.net profile, but you cannot use inactive account's character data.
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but should i be able to use the inactive account still for the fireteams functionality?